signal_i386.c 96.3 KB
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
/*
 * i386 signal handling routines
 *
 * Copyright 1999 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#ifdef __i386__

#include "config.h"
#include "wine/port.h"

#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYSCALL_H
# include <syscall.h>
#else
# ifdef HAVE_SYS_SYSCALL_H
#  include <sys/syscall.h>
# endif
#endif

#ifdef HAVE_SYS_VM86_H
# include <sys/vm86.h>
#endif

#ifdef HAVE_SYS_SIGNAL_H
# include <sys/signal.h>
#endif
#ifdef HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
#endif

#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "wine/library.h"
#include "ntdll_misc.h"
#include "wine/exception.h"
#include "wine/debug.h"

#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif

#undef ERR  /* Solaris needs to define this */

/* not defined for x86, so copy the x86_64 definition */
typedef struct DECLSPEC_ALIGN(16) _M128A
{
    ULONGLONG Low;
    LONGLONG High;
} M128A;

typedef struct
{
    WORD ControlWord;
    WORD StatusWord;
    BYTE TagWord;
    BYTE Reserved1;
    WORD ErrorOpcode;
    DWORD ErrorOffset;
    WORD ErrorSelector;
    WORD Reserved2;
    DWORD DataOffset;
    WORD DataSelector;
    WORD Reserved3;
    DWORD MxCsr;
    DWORD MxCsr_Mask;
    M128A FloatRegisters[8];
    M128A XmmRegisters[16];
    BYTE Reserved4[96];
} XMM_SAVE_AREA32;

/***********************************************************************
 * signal context platform-specific definitions
 */

#ifdef __ANDROID__

typedef struct ucontext
{
    unsigned long     uc_flags;
    struct ucontext  *uc_link;
    stack_t           uc_stack;
    struct sigcontext uc_mcontext;
    sigset_t          uc_sigmask;
} SIGCONTEXT;

#define EAX_sig(context)     ((context)->uc_mcontext.eax)
#define EBX_sig(context)     ((context)->uc_mcontext.ebx)
#define ECX_sig(context)     ((context)->uc_mcontext.ecx)
#define EDX_sig(context)     ((context)->uc_mcontext.edx)
#define ESI_sig(context)     ((context)->uc_mcontext.esi)
#define EDI_sig(context)     ((context)->uc_mcontext.edi)
#define EBP_sig(context)     ((context)->uc_mcontext.ebp)
#define ESP_sig(context)     ((context)->uc_mcontext.esp)

#define CS_sig(context)      ((context)->uc_mcontext.cs)
#define DS_sig(context)      ((context)->uc_mcontext.ds)
#define ES_sig(context)      ((context)->uc_mcontext.es)
#define SS_sig(context)      ((context)->uc_mcontext.ss)
#define FS_sig(context)      ((context)->uc_mcontext.fs)
#define GS_sig(context)      ((context)->uc_mcontext.gs)

#define EFL_sig(context)     ((context)->uc_mcontext.eflags)
#define EIP_sig(context)     ((context)->uc_mcontext.eip)
#define TRAP_sig(context)    ((context)->uc_mcontext.trapno)
#define ERROR_sig(context)   ((context)->uc_mcontext.err)

#define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpstate))
#define FPUX_sig(context)    (FPU_sig(context) && !((context)->uc_mcontext.fpstate->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)

#elif defined (__linux__)

typedef ucontext_t SIGCONTEXT;

#define EAX_sig(context)     ((context)->uc_mcontext.gregs[REG_EAX])
#define EBX_sig(context)     ((context)->uc_mcontext.gregs[REG_EBX])
#define ECX_sig(context)     ((context)->uc_mcontext.gregs[REG_ECX])
#define EDX_sig(context)     ((context)->uc_mcontext.gregs[REG_EDX])
#define ESI_sig(context)     ((context)->uc_mcontext.gregs[REG_ESI])
#define EDI_sig(context)     ((context)->uc_mcontext.gregs[REG_EDI])
#define EBP_sig(context)     ((context)->uc_mcontext.gregs[REG_EBP])
#define ESP_sig(context)     ((context)->uc_mcontext.gregs[REG_ESP])

#define CS_sig(context)      ((context)->uc_mcontext.gregs[REG_CS])
#define DS_sig(context)      ((context)->uc_mcontext.gregs[REG_DS])
#define ES_sig(context)      ((context)->uc_mcontext.gregs[REG_ES])
#define SS_sig(context)      ((context)->uc_mcontext.gregs[REG_SS])
#define FS_sig(context)      ((context)->uc_mcontext.gregs[REG_FS])
#define GS_sig(context)      ((context)->uc_mcontext.gregs[REG_GS])

#define EFL_sig(context)     ((context)->uc_mcontext.gregs[REG_EFL])
#define EIP_sig(context)     ((context)->uc_mcontext.gregs[REG_EIP])
#define TRAP_sig(context)    ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context)   ((context)->uc_mcontext.gregs[REG_ERR])

#define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
#define FPUX_sig(context)    (FPU_sig(context) && !((context)->uc_mcontext.fpregs->status >> 16) ? (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1) : NULL)

#define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
#define VIF_FLAG 0x00080000
#define VIP_FLAG 0x00100000

int vm86_enter( void **vm86_ptr );
void vm86_return(void);
void vm86_return_end(void);
__ASM_GLOBAL_FUNC(vm86_enter,
                  "pushl %ebp\n\t"
                  __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
                  __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
                  "movl %esp,%ebp\n\t"
                  __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
                  "pushl %ebx\n\t"
                  __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
                  "movl $166,%eax\n\t"  /*SYS_vm86*/
                  "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
                  "movl (%ecx),%ecx\n\t"
                  "movl $1,%ebx\n\t"    /*VM86_ENTER*/
                  "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
                  "pushl %fs\n\t"
                  "pushl %gs\n\t"
                  "int $0x80\n"
                  ".globl " __ASM_NAME("vm86_return") "\n\t"
                  __ASM_FUNC("vm86_return") "\n"
                  __ASM_NAME("vm86_return") ":\n\t"
                  "popl %gs\n\t"
                  "popl %fs\n\t"
                  "popl %ecx\n\t"
                  "popl %ebx\n\t"
                  __ASM_CFI(".cfi_same_value %ebx\n\t")
                  "popl %ebp\n\t"
                  __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
                  __ASM_CFI(".cfi_same_value %ebp\n\t")
                  "testl %eax,%eax\n\t"
                  "jl 0f\n\t"
                  "cmpb $0,%al\n\t" /* VM86_SIGNAL */
                  "je " __ASM_NAME("vm86_enter") "\n\t"
                  "0:\n\t"
                  "movl 4(%esp),%ecx\n\t"  /* vm86_ptr */
                  "movl $0,(%ecx)\n\t"
                  ".globl " __ASM_NAME("vm86_return_end") "\n\t"
                  __ASM_FUNC("vm86_return_end") "\n"
                  __ASM_NAME("vm86_return_end") ":\n\t"
                  "ret" )

#ifdef HAVE_SYS_VM86_H
# define __HAVE_VM86
#endif

#elif defined (__BSDI__)

#include <machine/frame.h>
typedef struct trapframe SIGCONTEXT;

#define EAX_sig(context)     ((context)->tf_eax)
#define EBX_sig(context)     ((context)->tf_ebx)
#define ECX_sig(context)     ((context)->tf_ecx)
#define EDX_sig(context)     ((context)->tf_edx)
#define ESI_sig(context)     ((context)->tf_esi)
#define EDI_sig(context)     ((context)->tf_edi)
#define EBP_sig(context)     ((context)->tf_ebp)

#define CS_sig(context)      ((context)->tf_cs)
#define DS_sig(context)      ((context)->tf_ds)
#define ES_sig(context)      ((context)->tf_es)
#define SS_sig(context)      ((context)->tf_ss)

#define EFL_sig(context)     ((context)->tf_eflags)

#define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
#define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))

#define FPU_sig(context)     NULL  /* FIXME */
#define FPUX_sig(context)    NULL  /* FIXME */

#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)

#include <machine/trap.h>

typedef struct sigcontext SIGCONTEXT;

#define EAX_sig(context)     ((context)->sc_eax)
#define EBX_sig(context)     ((context)->sc_ebx)
#define ECX_sig(context)     ((context)->sc_ecx)
#define EDX_sig(context)     ((context)->sc_edx)
#define ESI_sig(context)     ((context)->sc_esi)
#define EDI_sig(context)     ((context)->sc_edi)
#define EBP_sig(context)     ((context)->sc_ebp)

#define CS_sig(context)      ((context)->sc_cs)
#define DS_sig(context)      ((context)->sc_ds)
#define ES_sig(context)      ((context)->sc_es)
#define FS_sig(context)      ((context)->sc_fs)
#define GS_sig(context)      ((context)->sc_gs)
#define SS_sig(context)      ((context)->sc_ss)

#define TRAP_sig(context)    ((context)->sc_trapno)
#define ERROR_sig(context)   ((context)->sc_err)
#define EFL_sig(context)     ((context)->sc_eflags)

#define EIP_sig(context)     ((context)->sc_eip)
#define ESP_sig(context)     ((context)->sc_esp)

#define FPU_sig(context)     NULL  /* FIXME */
#define FPUX_sig(context)    NULL  /* FIXME */

#elif defined (__OpenBSD__)

typedef struct sigcontext SIGCONTEXT;

#define EAX_sig(context)     ((context)->sc_eax)
#define EBX_sig(context)     ((context)->sc_ebx)
#define ECX_sig(context)     ((context)->sc_ecx)
#define EDX_sig(context)     ((context)->sc_edx)
#define ESI_sig(context)     ((context)->sc_esi)
#define EDI_sig(context)     ((context)->sc_edi)
#define EBP_sig(context)     ((context)->sc_ebp)

#define CS_sig(context)      ((context)->sc_cs)
#define DS_sig(context)      ((context)->sc_ds)
#define ES_sig(context)      ((context)->sc_es)
#define FS_sig(context)      ((context)->sc_fs)
#define GS_sig(context)      ((context)->sc_gs)
#define SS_sig(context)      ((context)->sc_ss)

#define TRAP_sig(context)    ((context)->sc_trapno)
#define ERROR_sig(context)   ((context)->sc_err)
#define EFL_sig(context)     ((context)->sc_eflags)

#define EIP_sig(context)     ((context)->sc_eip)
#define ESP_sig(context)     ((context)->sc_esp)

#define FPU_sig(context)     NULL  /* FIXME */
#define FPUX_sig(context)    NULL  /* FIXME */

#define T_MCHK T_MACHK
#define T_XMMFLT T_XFTRAP

#elif defined(__svr4__) || defined(_SCO_DS) || defined(__sun)

#ifdef _SCO_DS
#include <sys/regset.h>
#endif
#include <sys/ucontext.h>
typedef struct ucontext SIGCONTEXT;

#ifdef _SCO_DS
#define gregs regs
#endif

#define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
#define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
#define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
#define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
#define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
#define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
#define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])

#define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
#define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
#define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
#define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])

#define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
#define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])

#define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])

#define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
#ifdef UESP
#define ESP_sig(context)     ((context)->uc_mcontext.gregs[UESP])
#elif defined(R_ESP)
#define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
#else
#define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
#endif
#ifdef ERR
#define ERROR_sig(context)   ((context)->uc_mcontext.gregs[ERR])
#endif
#ifdef TRAPNO
#define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
#endif

#define FPU_sig(context)     NULL  /* FIXME */
#define FPUX_sig(context)    NULL  /* FIXME */

#elif defined (__APPLE__)
# include <sys/ucontext.h>

typedef ucontext_t SIGCONTEXT;

/* work around silly renaming of struct members in OS X 10.5 */
#if __DARWIN_UNIX03 && defined(_STRUCT_X86_EXCEPTION_STATE32)
#define EAX_sig(context)     ((context)->uc_mcontext->__ss.__eax)
#define EBX_sig(context)     ((context)->uc_mcontext->__ss.__ebx)
#define ECX_sig(context)     ((context)->uc_mcontext->__ss.__ecx)
#define EDX_sig(context)     ((context)->uc_mcontext->__ss.__edx)
#define ESI_sig(context)     ((context)->uc_mcontext->__ss.__esi)
#define EDI_sig(context)     ((context)->uc_mcontext->__ss.__edi)
#define EBP_sig(context)     ((context)->uc_mcontext->__ss.__ebp)
#define CS_sig(context)      ((context)->uc_mcontext->__ss.__cs)
#define DS_sig(context)      ((context)->uc_mcontext->__ss.__ds)
#define ES_sig(context)      ((context)->uc_mcontext->__ss.__es)
#define FS_sig(context)      ((context)->uc_mcontext->__ss.__fs)
#define GS_sig(context)      ((context)->uc_mcontext->__ss.__gs)
#define SS_sig(context)      ((context)->uc_mcontext->__ss.__ss)
#define EFL_sig(context)     ((context)->uc_mcontext->__ss.__eflags)
#define EIP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->__ss.__eip))
#define ESP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->__ss.__esp))
#define TRAP_sig(context)    ((context)->uc_mcontext->__es.__trapno)
#define ERROR_sig(context)   ((context)->uc_mcontext->__es.__err)
#define FPU_sig(context)     NULL
#define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->__fs.__fpu_fcw)
#else
#define EAX_sig(context)     ((context)->uc_mcontext->ss.eax)
#define EBX_sig(context)     ((context)->uc_mcontext->ss.ebx)
#define ECX_sig(context)     ((context)->uc_mcontext->ss.ecx)
#define EDX_sig(context)     ((context)->uc_mcontext->ss.edx)
#define ESI_sig(context)     ((context)->uc_mcontext->ss.esi)
#define EDI_sig(context)     ((context)->uc_mcontext->ss.edi)
#define EBP_sig(context)     ((context)->uc_mcontext->ss.ebp)
#define CS_sig(context)      ((context)->uc_mcontext->ss.cs)
#define DS_sig(context)      ((context)->uc_mcontext->ss.ds)
#define ES_sig(context)      ((context)->uc_mcontext->ss.es)
#define FS_sig(context)      ((context)->uc_mcontext->ss.fs)
#define GS_sig(context)      ((context)->uc_mcontext->ss.gs)
#define SS_sig(context)      ((context)->uc_mcontext->ss.ss)
#define EFL_sig(context)     ((context)->uc_mcontext->ss.eflags)
#define EIP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
#define ESP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
#define TRAP_sig(context)    ((context)->uc_mcontext->es.trapno)
#define ERROR_sig(context)   ((context)->uc_mcontext->es.err)
#define FPU_sig(context)     NULL
#define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&(context)->uc_mcontext->fs.fpu_fcw)
#endif

#elif defined(__NetBSD__)
# include <sys/ucontext.h>
# include <sys/types.h>
# include <signal.h>

typedef ucontext_t SIGCONTEXT;

#define EAX_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EAX])
#define EBX_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EBX])
#define ECX_sig(context)       ((context)->uc_mcontext.__gregs[_REG_ECX])
#define EDX_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EDX])
#define ESI_sig(context)       ((context)->uc_mcontext.__gregs[_REG_ESI])
#define EDI_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EDI])
#define EBP_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EBP])
#define ESP_sig(context)       _UC_MACHINE_SP(context)

#define CS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_CS])
#define DS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_DS])
#define ES_sig(context)        ((context)->uc_mcontext.__gregs[_REG_ES])
#define SS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_SS])
#define FS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_FS])
#define GS_sig(context)        ((context)->uc_mcontext.__gregs[_REG_GS])

#define EFL_sig(context)       ((context)->uc_mcontext.__gregs[_REG_EFL])
#define EIP_sig(context)       _UC_MACHINE_PC(context)
#define TRAP_sig(context)      ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
#define ERROR_sig(context)     ((context)->uc_mcontext.__gregs[_REG_ERR])

#define FPU_sig(context)     NULL
#define FPUX_sig(context)    ((XMM_SAVE_AREA32 *)&((context)->uc_mcontext.__fpregs))

#define T_MCHK T_MCA
#define T_XMMFLT T_XMM

#elif defined(__GNU__)
typedef ucontext_t SIGCONTEXT;

#define EAX_sig(context)     ((context)->uc_mcontext.gregs[REG_EAX])
#define EBX_sig(context)     ((context)->uc_mcontext.gregs[REG_EBX])
#define ECX_sig(context)     ((context)->uc_mcontext.gregs[REG_ECX])
#define EDX_sig(context)     ((context)->uc_mcontext.gregs[REG_EDX])
#define ESI_sig(context)     ((context)->uc_mcontext.gregs[REG_ESI])
#define EDI_sig(context)     ((context)->uc_mcontext.gregs[REG_EDI])
#define EBP_sig(context)     ((context)->uc_mcontext.gregs[REG_EBP])
#define ESP_sig(context)     ((context)->uc_mcontext.gregs[REG_ESP])

#define CS_sig(context)      ((context)->uc_mcontext.gregs[REG_CS])
#define DS_sig(context)      ((context)->uc_mcontext.gregs[REG_DS])
#define ES_sig(context)      ((context)->uc_mcontext.gregs[REG_ES])
#define SS_sig(context)      ((context)->uc_mcontext.gregs[REG_SS])
#define FS_sig(context)      ((context)->uc_mcontext.gregs[REG_FS])
#define GS_sig(context)      ((context)->uc_mcontext.gregs[REG_GS])

#define EFL_sig(context)     ((context)->uc_mcontext.gregs[REG_EFL])
#define EIP_sig(context)     ((context)->uc_mcontext.gregs[REG_EIP])
#define TRAP_sig(context)    ((context)->uc_mcontext.gregs[REG_TRAPNO])
#define ERROR_sig(context)   ((context)->uc_mcontext.gregs[REG_ERR])

#define FPU_sig(context)     ((FLOATING_SAVE_AREA *)&(context)->uc_mcontext.fpregs.fp_reg_set.fpchip_state)
#define FPUX_sig(context)    NULL

#else
#error You must define the signal context functions for your platform
#endif /* linux */

WINE_DEFAULT_DEBUG_CHANNEL(seh);

typedef int (*wine_signal_handler)(unsigned int sig);

static const size_t teb_size = 4096;  /* we reserve one page for the TEB */
static size_t signal_stack_mask;
static size_t signal_stack_size;

static wine_signal_handler handlers[256];

static BOOL fpux_support;  /* whether the CPU supports extended fpu context */

extern void DECLSPEC_NORETURN __wine_restore_regs( const CONTEXT *context );

enum i386_trap_code
{
    TRAP_x86_UNKNOWN    = -1,  /* Unknown fault (TRAP_sig not defined) */
#if defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
    TRAP_x86_DIVIDE     = T_DIVIDE,     /* Division by zero exception */
    TRAP_x86_TRCTRAP    = T_TRCTRAP,    /* Single-step exception */
    TRAP_x86_NMI        = T_NMI,        /* NMI interrupt */
    TRAP_x86_BPTFLT     = T_BPTFLT,     /* Breakpoint exception */
    TRAP_x86_OFLOW      = T_OFLOW,      /* Overflow exception */
    TRAP_x86_BOUND      = T_BOUND,      /* Bound range exception */
    TRAP_x86_PRIVINFLT  = T_PRIVINFLT,  /* Invalid opcode exception */
    TRAP_x86_DNA        = T_DNA,        /* Device not available exception */
    TRAP_x86_DOUBLEFLT  = T_DOUBLEFLT,  /* Double fault exception */
    TRAP_x86_FPOPFLT    = T_FPOPFLT,    /* Coprocessor segment overrun */
    TRAP_x86_TSSFLT     = T_TSSFLT,     /* Invalid TSS exception */
    TRAP_x86_SEGNPFLT   = T_SEGNPFLT,   /* Segment not present exception */
    TRAP_x86_STKFLT     = T_STKFLT,     /* Stack fault */
    TRAP_x86_PROTFLT    = T_PROTFLT,    /* General protection fault */
    TRAP_x86_PAGEFLT    = T_PAGEFLT,    /* Page fault */
    TRAP_x86_ARITHTRAP  = T_ARITHTRAP,  /* Floating point exception */
    TRAP_x86_ALIGNFLT   = T_ALIGNFLT,   /* Alignment check exception */
    TRAP_x86_MCHK       = T_MCHK,       /* Machine check exception */
    TRAP_x86_CACHEFLT   = T_XMMFLT      /* Cache flush exception */
#else
    TRAP_x86_DIVIDE     = 0,   /* Division by zero exception */
    TRAP_x86_TRCTRAP    = 1,   /* Single-step exception */
    TRAP_x86_NMI        = 2,   /* NMI interrupt */
    TRAP_x86_BPTFLT     = 3,   /* Breakpoint exception */
    TRAP_x86_OFLOW      = 4,   /* Overflow exception */
    TRAP_x86_BOUND      = 5,   /* Bound range exception */
    TRAP_x86_PRIVINFLT  = 6,   /* Invalid opcode exception */
    TRAP_x86_DNA        = 7,   /* Device not available exception */
    TRAP_x86_DOUBLEFLT  = 8,   /* Double fault exception */
    TRAP_x86_FPOPFLT    = 9,   /* Coprocessor segment overrun */
    TRAP_x86_TSSFLT     = 10,  /* Invalid TSS exception */
    TRAP_x86_SEGNPFLT   = 11,  /* Segment not present exception */
    TRAP_x86_STKFLT     = 12,  /* Stack fault */
    TRAP_x86_PROTFLT    = 13,  /* General protection fault */
    TRAP_x86_PAGEFLT    = 14,  /* Page fault */
    TRAP_x86_ARITHTRAP  = 16,  /* Floating point exception */
    TRAP_x86_ALIGNFLT   = 17,  /* Alignment check exception */
    TRAP_x86_MCHK       = 18,  /* Machine check exception */
    TRAP_x86_CACHEFLT   = 19   /* SIMD exception (via SIGFPE) if CPU is SSE capable
                                  otherwise Cache flush exception (via SIGSEV) */
#endif
};

/* Exception record for handling exceptions happening inside exception handlers */
typedef struct
{
    EXCEPTION_REGISTRATION_RECORD frame;
    EXCEPTION_REGISTRATION_RECORD *prevFrame;
} EXC_NESTED_FRAME;

extern DWORD EXC_CallHandler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
                              CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher,
                              PEXCEPTION_HANDLER handler, PEXCEPTION_HANDLER nested_handler );

/***********************************************************************
 *           dispatch_signal
 */
static inline int dispatch_signal(unsigned int sig)
{
    if (handlers[sig] == NULL) return 0;
    return handlers[sig](sig);
}


/***********************************************************************
 *           get_trap_code
 *
 * Get the trap code for a signal.
 */
static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
{
#ifdef TRAP_sig
    return TRAP_sig(sigcontext);
#else
    return TRAP_x86_UNKNOWN;  /* unknown trap code */
#endif
}

/***********************************************************************
 *           get_error_code
 *
 * Get the error code for a signal.
 */
static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
{
#ifdef ERROR_sig
    return ERROR_sig(sigcontext);
#else
    return 0;
#endif
}

/***********************************************************************
 *           get_signal_stack
 *
 * Get the base of the signal stack for the current thread.
 */
static inline void *get_signal_stack(void)
{
    return (char *)NtCurrentTeb() + 4096;
}


/***********************************************************************
 *           get_current_teb
 *
 * Get the current teb based on the stack pointer.
 */
static inline TEB *get_current_teb(void)
{
    unsigned long esp;
    __asm__("movl %%esp,%0" : "=g" (esp) );
    return (TEB *)(esp & ~signal_stack_mask);
}


/*******************************************************************
 *         is_valid_frame
 */
static inline BOOL is_valid_frame( void *frame )
{
    if ((ULONG_PTR)frame & 3) return FALSE;
    return (frame >= NtCurrentTeb()->Tib.StackLimit &&
            (void **)frame < (void **)NtCurrentTeb()->Tib.StackBase - 1);
}

/*******************************************************************
 *         raise_handler
 *
 * Handler for exceptions happening inside a handler.
 */
static DWORD raise_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                            CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
        return ExceptionContinueSearch;
    /* We shouldn't get here so we store faulty frame in dispatcher */
    *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
    return ExceptionNestedException;
}


/*******************************************************************
 *         unwind_handler
 *
 * Handler for exceptions happening inside an unwind handler.
 */
static DWORD unwind_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
                             CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
{
    if (!(rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
        return ExceptionContinueSearch;
    /* We shouldn't get here so we store faulty frame in dispatcher */
    *dispatcher = ((EXC_NESTED_FRAME*)frame)->prevFrame;
    return ExceptionCollidedUnwind;
}


/**********************************************************************
 *           call_stack_handlers
 *
 * Call the stack handlers chain.
 */
static NTSTATUS call_stack_handlers( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    EXCEPTION_REGISTRATION_RECORD *frame, *dispatch, *nested_frame;
    DWORD res;

    frame = NtCurrentTeb()->Tib.ExceptionList;
    nested_frame = NULL;
    while (frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL)
    {
        /* Check frame address */
        if (!is_valid_frame( frame ))
        {
            rec->ExceptionFlags |= EH_STACK_INVALID;
            break;
        }

        /* Call handler */
        TRACE( "calling handler at %p code=%x flags=%x\n",
               frame->Handler, rec->ExceptionCode, rec->ExceptionFlags );
        res = EXC_CallHandler( rec, frame, context, &dispatch, frame->Handler, raise_handler );
        TRACE( "handler at %p returned %x\n", frame->Handler, res );

        if (frame == nested_frame)
        {
            /* no longer nested */
            nested_frame = NULL;
            rec->ExceptionFlags &= ~EH_NESTED_CALL;
        }

        switch(res)
        {
        case ExceptionContinueExecution:
            if (!(rec->ExceptionFlags & EH_NONCONTINUABLE)) return STATUS_SUCCESS;
            return STATUS_NONCONTINUABLE_EXCEPTION;
        case ExceptionContinueSearch:
            break;
        case ExceptionNestedException:
            if (nested_frame < dispatch) nested_frame = dispatch;
            rec->ExceptionFlags |= EH_NESTED_CALL;
            break;
        default:
            return STATUS_INVALID_DISPOSITION;
        }
        frame = frame->Prev;
    }
    return STATUS_UNHANDLED_EXCEPTION;
}


/*******************************************************************
 *		raise_exception
 *
 * Implementation of NtRaiseException.
 */
static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
{
    NTSTATUS status;

    if (first_chance)
    {
        DWORD c;

        TRACE( "code=%x flags=%x addr=%p ip=%08x tid=%04x\n",
               rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
               context->Eip, GetCurrentThreadId() );
        for (c = 0; c < rec->NumberParameters; c++)
            TRACE( " info[%d]=%08lx\n", c, rec->ExceptionInformation[c] );
        if (rec->ExceptionCode == EXCEPTION_WINE_STUB)
        {
            if (rec->ExceptionInformation[1] >> 16)
                MESSAGE( "wine: Call from %p to unimplemented function %s.%s, aborting\n",
                         rec->ExceptionAddress,
                         (char*)rec->ExceptionInformation[0], (char*)rec->ExceptionInformation[1] );
            else
                MESSAGE( "wine: Call from %p to unimplemented function %s.%ld, aborting\n",
                         rec->ExceptionAddress,
                         (char*)rec->ExceptionInformation[0], rec->ExceptionInformation[1] );
        }
        else
        {
            TRACE(" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n",
                  context->Eax, context->Ebx, context->Ecx,
                  context->Edx, context->Esi, context->Edi );
            TRACE(" ebp=%08x esp=%08x cs=%04x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
                  context->Ebp, context->Esp, context->SegCs, context->SegDs,
                  context->SegEs, context->SegFs, context->SegGs, context->EFlags );
        }
        status = send_debug_event( rec, TRUE, context );
        if (status == DBG_CONTINUE || status == DBG_EXCEPTION_HANDLED)
            return STATUS_SUCCESS;

        /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
        if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context->Eip--;

        if (call_vectored_handlers( rec, context ) == EXCEPTION_CONTINUE_EXECUTION)
            return STATUS_SUCCESS;

        if ((status = call_stack_handlers( rec, context )) != STATUS_UNHANDLED_EXCEPTION)
            return status;
    }

    /* last chance exception */

    status = send_debug_event( rec, FALSE, context );
    if (status != DBG_CONTINUE)
    {
        if (rec->ExceptionFlags & EH_STACK_INVALID)
            WINE_ERR("Exception frame is not in stack limits => unable to dispatch exception.\n");
        else if (rec->ExceptionCode == STATUS_NONCONTINUABLE_EXCEPTION)
            WINE_ERR("Process attempted to continue execution after noncontinuable exception.\n");
        else
            WINE_ERR("Unhandled exception code %x flags %x addr %p\n",
                     rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress );
        NtTerminateProcess( NtCurrentProcess(), rec->ExceptionCode );
    }
    return STATUS_SUCCESS;
}


#ifdef __HAVE_VM86
/***********************************************************************
 *           save_vm86_context
 *
 * Set the register values from a vm86 structure.
 */
static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
{
    context->ContextFlags = CONTEXT_FULL;
    context->Eax    = vm86->regs.eax;
    context->Ebx    = vm86->regs.ebx;
    context->Ecx    = vm86->regs.ecx;
    context->Edx    = vm86->regs.edx;
    context->Esi    = vm86->regs.esi;
    context->Edi    = vm86->regs.edi;
    context->Esp    = vm86->regs.esp;
    context->Ebp    = vm86->regs.ebp;
    context->Eip    = vm86->regs.eip;
    context->SegCs  = vm86->regs.cs;
    context->SegDs  = vm86->regs.ds;
    context->SegEs  = vm86->regs.es;
    context->SegFs  = vm86->regs.fs;
    context->SegGs  = vm86->regs.gs;
    context->SegSs  = vm86->regs.ss;
    context->EFlags = vm86->regs.eflags;
}


/***********************************************************************
 *           restore_vm86_context
 *
 * Build a vm86 structure from the register values.
 */
static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
{
    vm86->regs.eax    = context->Eax;
    vm86->regs.ebx    = context->Ebx;
    vm86->regs.ecx    = context->Ecx;
    vm86->regs.edx    = context->Edx;
    vm86->regs.esi    = context->Esi;
    vm86->regs.edi    = context->Edi;
    vm86->regs.esp    = context->Esp;
    vm86->regs.ebp    = context->Ebp;
    vm86->regs.eip    = context->Eip;
    vm86->regs.cs     = context->SegCs;
    vm86->regs.ds     = context->SegDs;
    vm86->regs.es     = context->SegEs;
    vm86->regs.fs     = context->SegFs;
    vm86->regs.gs     = context->SegGs;
    vm86->regs.ss     = context->SegSs;
    vm86->regs.eflags = context->EFlags;
}


/**********************************************************************
 *		merge_vm86_pending_flags
 *
 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
 * raises exception if there are pending events and VIF flag
 * has been turned on.
 *
 * Called from __wine_enter_vm86 because vm86_enter
 * doesn't check for pending events. 
 *
 * Called from raise_vm86_sti_exception to check for
 * pending events in a signal safe way.
 */
static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
{
    BOOL check_pending = TRUE;
    struct vm86plus_struct *vm86 =
        (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);

    /*
     * In order to prevent a race when SIGUSR2 occurs while
     * we are returning from exception handler, pending events
     * will be rechecked after each raised exception.
     */
    while (check_pending && get_vm86_teb_info()->vm86_pending)
    {
        check_pending = FALSE;
        ntdll_get_thread_data()->vm86_ptr = NULL;
            
        /*
         * If VIF is set, throw exception.
         * Note that SIGUSR2 may turn VIF flag off so
         * VIF check must occur only when TEB.vm86_ptr is NULL.
         */
        if (vm86->regs.eflags & VIF_FLAG)
        {
            CONTEXT vcontext;
            save_vm86_context( &vcontext, vm86 );
            
            rec->ExceptionCode    = EXCEPTION_VM86_STI;
            rec->ExceptionFlags   = EXCEPTION_CONTINUABLE;
            rec->ExceptionRecord  = NULL;
            rec->NumberParameters = 0;
            rec->ExceptionAddress = (LPVOID)vcontext.Eip;

            vcontext.EFlags &= ~VIP_FLAG;
            get_vm86_teb_info()->vm86_pending = 0;
            raise_exception( rec, &vcontext, TRUE );

            restore_vm86_context( &vcontext, vm86 );
            check_pending = TRUE;
        }

        ntdll_get_thread_data()->vm86_ptr = vm86;
    }

    /*
     * Merge VIP flags in a signal safe way. This requires
     * that the following operation compiles into atomic
     * instruction.
     */
    vm86->regs.eflags |= get_vm86_teb_info()->vm86_pending;
}
#endif /* __HAVE_VM86 */


#ifdef __sun

/* We have to workaround two Solaris breakages:
 * - Solaris doesn't restore %ds and %es before calling the signal handler so exceptions in 16-bit
 *   code crash badly.
 * - Solaris inserts a libc trampoline to call our handler, but the trampoline expects that registers
 *   are setup correctly. So we need to insert our own trampoline below the libc trampoline to set %gs.
 */

extern int sigaction_syscall( int sig, const struct sigaction *new, struct sigaction *old );
__ASM_GLOBAL_FUNC( sigaction_syscall,
                  "movl $0x62,%eax\n\t"
                  "int $0x91\n\t"
                  "ret" )

/* assume the same libc handler is used for all signals */
static void (*libc_sigacthandler)( int signal, siginfo_t *siginfo, void *context );

static void wine_sigacthandler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    struct ntdll_thread_data *thread_data;

    __asm__ __volatile__("mov %ss,%ax; mov %ax,%ds; mov %ax,%es");

    thread_data = (struct ntdll_thread_data *)get_current_teb()->SpareBytes1;
    wine_set_fs( thread_data->fs );
    wine_set_gs( thread_data->gs );

    libc_sigacthandler( signal, siginfo, sigcontext );
}

static int solaris_sigaction( int sig, const struct sigaction *new, struct sigaction *old )
{
    struct sigaction real_act;

    if (sigaction( sig, new, old ) == -1) return -1;

    /* retrieve the real handler and flags with a direct syscall */
    sigaction_syscall( sig, NULL, &real_act );
    libc_sigacthandler = real_act.sa_sigaction;
    real_act.sa_sigaction = wine_sigacthandler;
    sigaction_syscall( sig, &real_act, NULL );
    return 0;
}
#define sigaction(sig,new,old) solaris_sigaction(sig,new,old)

#endif

typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );

extern void clear_alignment_flag(void);
__ASM_GLOBAL_FUNC( clear_alignment_flag,
                   "pushfl\n\t"
                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
                   "andl $~0x40000,(%esp)\n\t"
                   "popfl\n\t"
                   __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
                   "ret" )


/***********************************************************************
 *           init_handler
 *
 * Handler initialization when the full context is not needed.
 * Return the stack pointer to use for pushing the exception data.
 */
static inline void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
{
    TEB *teb = get_current_teb();

    clear_alignment_flag();

    /* get %fs and %gs at time of the fault */
#ifdef FS_sig
    *fs = LOWORD(FS_sig(sigcontext));
#else
    *fs = wine_get_fs();
#endif
#ifdef GS_sig
    *gs = LOWORD(GS_sig(sigcontext));
#else
    *gs = wine_get_gs();
#endif

#ifndef __sun  /* see above for Solaris handling */
    {
        struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
        wine_set_fs( thread_data->fs );
        wine_set_gs( thread_data->gs );
    }
#endif

    if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
        !wine_ldt_is_system(SS_sig(sigcontext)))  /* 16-bit mode */
    {
        /*
         * Win16 or DOS protected mode. Note that during switch
         * from 16-bit mode to linear mode, CS may be set to system
         * segment before FS is restored. Fortunately, in this case
         * SS is still non-system segment. This is why both CS and SS
         * are checked.
         */
        return teb->WOW32Reserved;
    }
    return (void *)(ESP_sig(sigcontext) & ~3);
}


/***********************************************************************
 *           save_fpu
 *
 * Save the thread FPU context.
 */
static inline void save_fpu( CONTEXT *context )
{
#ifdef __GNUC__
    context->ContextFlags |= CONTEXT_FLOATING_POINT;
    __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
#endif
}


/***********************************************************************
 *           save_fpux
 *
 * Save the thread FPU extended context.
 */
static inline void save_fpux( CONTEXT *context )
{
#ifdef __GNUC__
    /* we have to enforce alignment by hand */
    char buffer[sizeof(XMM_SAVE_AREA32) + 16];
    XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);

    __asm__ __volatile__( "fxsave %0" : "=m" (*state) );
    context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
    memcpy( context->ExtendedRegisters, state, sizeof(*state) );
#endif
}


/***********************************************************************
 *           restore_fpu
 *
 * Restore the FPU context to a sigcontext.
 */
static inline void restore_fpu( const CONTEXT *context )
{
    FLOATING_SAVE_AREA float_status = context->FloatSave;
    /* reset the current interrupt status */
    float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
#ifdef __GNUC__
    __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
#endif  /* __GNUC__ */
}


/***********************************************************************
 *           restore_fpux
 *
 * Restore the FPU extended context to a sigcontext.
 */
static inline void restore_fpux( const CONTEXT *context )
{
#ifdef __GNUC__
    /* we have to enforce alignment by hand */
    char buffer[sizeof(XMM_SAVE_AREA32) + 16];
    XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);

    memcpy( state, context->ExtendedRegisters, sizeof(*state) );
    /* reset the current interrupt status */
    state->StatusWord &= state->ControlWord | 0xff80;
    __asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
#endif
}


/***********************************************************************
 *           fpux_to_fpu
 *
 * Build a standard FPU context from an extended one.
 */
static void fpux_to_fpu( FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
{
    unsigned int i, tag, stack_top;

    fpu->ControlWord   = fpux->ControlWord | 0xffff0000;
    fpu->StatusWord    = fpux->StatusWord | 0xffff0000;
    fpu->ErrorOffset   = fpux->ErrorOffset;
    fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
    fpu->DataOffset    = fpux->DataOffset;
    fpu->DataSelector  = fpux->DataSelector;
    fpu->Cr0NpxState   = fpux->StatusWord | 0xffff0000;

    stack_top = (fpux->StatusWord >> 11) & 7;
    fpu->TagWord = 0xffff0000;
    for (i = 0; i < 8; i++)
    {
        memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
        if (!(fpux->TagWord & (1 << i))) tag = 3;  /* empty */
        else
        {
            const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
            if ((reg->High & 0x7fff) == 0x7fff)  /* exponent all ones */
            {
                tag = 2;  /* special */
            }
            else if (!(reg->High & 0x7fff))  /* exponent all zeroes */
            {
                if (reg->Low) tag = 2;  /* special */
                else tag = 1;  /* zero */
            }
            else
            {
                if (reg->Low >> 63) tag = 0;  /* valid */
                else tag = 2;  /* special */
            }
        }
        fpu->TagWord |= tag << (2 * i);
    }
}


/***********************************************************************
 *           save_context
 *
 * Build a context structure from the signal info.
 */
static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
{
    struct ntdll_thread_data * const regs = ntdll_get_thread_data();
    FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
    XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);

    memset(context, 0, sizeof(*context));
    context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
    context->Eax          = EAX_sig(sigcontext);
    context->Ebx          = EBX_sig(sigcontext);
    context->Ecx          = ECX_sig(sigcontext);
    context->Edx          = EDX_sig(sigcontext);
    context->Esi          = ESI_sig(sigcontext);
    context->Edi          = EDI_sig(sigcontext);
    context->Ebp          = EBP_sig(sigcontext);
    context->EFlags       = EFL_sig(sigcontext);
    context->Eip          = EIP_sig(sigcontext);
    context->Esp          = ESP_sig(sigcontext);
    context->SegCs        = LOWORD(CS_sig(sigcontext));
    context->SegDs        = LOWORD(DS_sig(sigcontext));
    context->SegEs        = LOWORD(ES_sig(sigcontext));
    context->SegFs        = fs;
    context->SegGs        = gs;
    context->SegSs        = LOWORD(SS_sig(sigcontext));
    context->Dr0          = regs->dr0;
    context->Dr1          = regs->dr1;
    context->Dr2          = regs->dr2;
    context->Dr3          = regs->dr3;
    context->Dr6          = regs->dr6;
    context->Dr7          = regs->dr7;

    if (fpu)
    {
        context->ContextFlags |= CONTEXT_FLOATING_POINT;
        context->FloatSave = *fpu;
    }
    if (fpux)
    {
        context->ContextFlags |= CONTEXT_FLOATING_POINT | CONTEXT_EXTENDED_REGISTERS;
        memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
        fpux_support = TRUE;
        if (!fpu) fpux_to_fpu( &context->FloatSave, fpux );
    }
    if (!fpu && !fpux) save_fpu( context );
}


/***********************************************************************
 *           restore_context
 *
 * Restore the signal info from the context.
 */
static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
{
    struct ntdll_thread_data * const regs = ntdll_get_thread_data();
    FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
    XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);

    regs->dr0 = context->Dr0;
    regs->dr1 = context->Dr1;
    regs->dr2 = context->Dr2;
    regs->dr3 = context->Dr3;
    regs->dr6 = context->Dr6;
    regs->dr7 = context->Dr7;
    EAX_sig(sigcontext) = context->Eax;
    EBX_sig(sigcontext) = context->Ebx;
    ECX_sig(sigcontext) = context->Ecx;
    EDX_sig(sigcontext) = context->Edx;
    ESI_sig(sigcontext) = context->Esi;
    EDI_sig(sigcontext) = context->Edi;
    EBP_sig(sigcontext) = context->Ebp;
    EFL_sig(sigcontext) = context->EFlags;
    EIP_sig(sigcontext) = context->Eip;
    ESP_sig(sigcontext) = context->Esp;
    CS_sig(sigcontext)  = context->SegCs;
    DS_sig(sigcontext)  = context->SegDs;
    ES_sig(sigcontext)  = context->SegEs;
    SS_sig(sigcontext)  = context->SegSs;
#ifdef GS_sig
    GS_sig(sigcontext)  = context->SegGs;
#else
    wine_set_gs( context->SegGs );
#endif
#ifdef FS_sig
    FS_sig(sigcontext)  = context->SegFs;
#else
    wine_set_fs( context->SegFs );
#endif

    if (fpu) *fpu = context->FloatSave;
    if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
    if (!fpu && !fpux) restore_fpu( context );
}


/***********************************************************************
 *		RtlCaptureContext (NTDLL.@)
 */
__ASM_STDCALL_FUNC( RtlCaptureContext, 4,
                    "pushl %eax\n\t"
                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
                    "movl 8(%esp),%eax\n\t"    /* context */
                    "movl $0x10007,(%eax)\n\t" /* context->ContextFlags */
                    "movw %gs,0x8c(%eax)\n\t"  /* context->SegGs */
                    "movw %fs,0x90(%eax)\n\t"  /* context->SegFs */
                    "movw %es,0x94(%eax)\n\t"  /* context->SegEs */
                    "movw %ds,0x98(%eax)\n\t"  /* context->SegDs */
                    "movl %edi,0x9c(%eax)\n\t" /* context->Edi */
                    "movl %esi,0xa0(%eax)\n\t" /* context->Esi */
                    "movl %ebx,0xa4(%eax)\n\t" /* context->Ebx */
                    "movl %edx,0xa8(%eax)\n\t" /* context->Edx */
                    "movl %ecx,0xac(%eax)\n\t" /* context->Ecx */
                    "movl %ebp,0xb4(%eax)\n\t" /* context->Ebp */
                    "movl 4(%esp),%edx\n\t"
                    "movl %edx,0xb8(%eax)\n\t" /* context->Eip */
                    "movw %cs,0xbc(%eax)\n\t"  /* context->SegCs */
                    "pushfl\n\t"
                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
                    "popl 0xc0(%eax)\n\t"      /* context->EFlags */
                    __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
                    "leal 8(%esp),%edx\n\t"
                    "movl %edx,0xc4(%eax)\n\t" /* context->Esp */
                    "movw %ss,0xc8(%eax)\n\t"  /* context->SegSs */
                    "popl 0xb0(%eax)\n\t"      /* context->Eax */
                    __ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
                    "ret $4" )


/***********************************************************************
 *           set_cpu_context
 *
 * Set the new CPU context. Used by NtSetContextThread.
 */
void set_cpu_context( const CONTEXT *context )
{
    DWORD flags = context->ContextFlags & ~CONTEXT_i386;

    if ((flags & CONTEXT_EXTENDED_REGISTERS) && fpux_support) restore_fpux( context );
    else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );

    if (flags & CONTEXT_DEBUG_REGISTERS)
    {
        ntdll_get_thread_data()->dr0 = context->Dr0;
        ntdll_get_thread_data()->dr1 = context->Dr1;
        ntdll_get_thread_data()->dr2 = context->Dr2;
        ntdll_get_thread_data()->dr3 = context->Dr3;
        ntdll_get_thread_data()->dr6 = context->Dr6;
        ntdll_get_thread_data()->dr7 = context->Dr7;
    }
    if (flags & CONTEXT_FULL)
    {
        if (!(flags & CONTEXT_CONTROL))
            FIXME( "setting partial context (%x) not supported\n", flags );
        else if (flags & CONTEXT_SEGMENTS)
            __wine_restore_regs( context );
        else
        {
            CONTEXT newcontext = *context;
            newcontext.SegDs = wine_get_ds();
            newcontext.SegEs = wine_get_es();
            newcontext.SegFs = wine_get_fs();
            newcontext.SegGs = wine_get_gs();
            __wine_restore_regs( &newcontext );
        }
    }
}


/***********************************************************************
 *           set_debug_registers
 */
static void set_debug_registers( const CONTEXT *context )
{
    DWORD flags = context->ContextFlags & ~CONTEXT_i386;
    context_t server_context;

    if (!(flags & CONTEXT_DEBUG_REGISTERS)) return;
    if (ntdll_get_thread_data()->dr0 == context->Dr0 &&
        ntdll_get_thread_data()->dr1 == context->Dr1 &&
        ntdll_get_thread_data()->dr2 == context->Dr2 &&
        ntdll_get_thread_data()->dr3 == context->Dr3 &&
        ntdll_get_thread_data()->dr6 == context->Dr6 &&
        ntdll_get_thread_data()->dr7 == context->Dr7) return;

    context_to_server( &server_context, context );

    SERVER_START_REQ( set_thread_context )
    {
        req->handle  = wine_server_obj_handle( GetCurrentThread() );
        req->suspend = 0;
        wine_server_add_data( req, &server_context, sizeof(server_context) );
        wine_server_call( req );
    }
    SERVER_END_REQ;
}


/***********************************************************************
 *           copy_context
 *
 * Copy a register context according to the flags.
 */
void copy_context( CONTEXT *to, const CONTEXT *from, DWORD flags )
{
    flags &= ~CONTEXT_i386;  /* get rid of CPU id */
    if (flags & CONTEXT_INTEGER)
    {
        to->Eax = from->Eax;
        to->Ebx = from->Ebx;
        to->Ecx = from->Ecx;
        to->Edx = from->Edx;
        to->Esi = from->Esi;
        to->Edi = from->Edi;
    }
    if (flags & CONTEXT_CONTROL)
    {
        to->Ebp    = from->Ebp;
        to->Esp    = from->Esp;
        to->Eip    = from->Eip;
        to->SegCs  = from->SegCs;
        to->SegSs  = from->SegSs;
        to->EFlags = from->EFlags;
    }
    if (flags & CONTEXT_SEGMENTS)
    {
        to->SegDs = from->SegDs;
        to->SegEs = from->SegEs;
        to->SegFs = from->SegFs;
        to->SegGs = from->SegGs;
    }
    if (flags & CONTEXT_DEBUG_REGISTERS)
    {
        to->Dr0 = from->Dr0;
        to->Dr1 = from->Dr1;
        to->Dr2 = from->Dr2;
        to->Dr3 = from->Dr3;
        to->Dr6 = from->Dr6;
        to->Dr7 = from->Dr7;
    }
    if (flags & CONTEXT_FLOATING_POINT)
    {
        to->FloatSave = from->FloatSave;
    }
    if (flags & CONTEXT_EXTENDED_REGISTERS)
    {
        memcpy( to->ExtendedRegisters, from->ExtendedRegisters, sizeof(to->ExtendedRegisters) );
    }
}


/***********************************************************************
 *           context_to_server
 *
 * Convert a register context to the server format.
 */
NTSTATUS context_to_server( context_t *to, const CONTEXT *from )
{
    DWORD flags = from->ContextFlags & ~CONTEXT_i386;  /* get rid of CPU id */

    memset( to, 0, sizeof(*to) );
    to->cpu = CPU_x86;

    if (flags & CONTEXT_CONTROL)
    {
        to->flags |= SERVER_CTX_CONTROL;
        to->ctl.i386_regs.ebp    = from->Ebp;
        to->ctl.i386_regs.esp    = from->Esp;
        to->ctl.i386_regs.eip    = from->Eip;
        to->ctl.i386_regs.cs     = from->SegCs;
        to->ctl.i386_regs.ss     = from->SegSs;
        to->ctl.i386_regs.eflags = from->EFlags;
    }
    if (flags & CONTEXT_INTEGER)
    {
        to->flags |= SERVER_CTX_INTEGER;
        to->integer.i386_regs.eax = from->Eax;
        to->integer.i386_regs.ebx = from->Ebx;
        to->integer.i386_regs.ecx = from->Ecx;
        to->integer.i386_regs.edx = from->Edx;
        to->integer.i386_regs.esi = from->Esi;
        to->integer.i386_regs.edi = from->Edi;
    }
    if (flags & CONTEXT_SEGMENTS)
    {
        to->flags |= SERVER_CTX_SEGMENTS;
        to->seg.i386_regs.ds = from->SegDs;
        to->seg.i386_regs.es = from->SegEs;
        to->seg.i386_regs.fs = from->SegFs;
        to->seg.i386_regs.gs = from->SegGs;
    }
    if (flags & CONTEXT_FLOATING_POINT)
    {
        to->flags |= SERVER_CTX_FLOATING_POINT;
        to->fp.i386_regs.ctrl     = from->FloatSave.ControlWord;
        to->fp.i386_regs.status   = from->FloatSave.StatusWord;
        to->fp.i386_regs.tag      = from->FloatSave.TagWord;
        to->fp.i386_regs.err_off  = from->FloatSave.ErrorOffset;
        to->fp.i386_regs.err_sel  = from->FloatSave.ErrorSelector;
        to->fp.i386_regs.data_off = from->FloatSave.DataOffset;
        to->fp.i386_regs.data_sel = from->FloatSave.DataSelector;
        to->fp.i386_regs.cr0npx   = from->FloatSave.Cr0NpxState;
        memcpy( to->fp.i386_regs.regs, from->FloatSave.RegisterArea, sizeof(to->fp.i386_regs.regs) );
    }
    if (flags & CONTEXT_DEBUG_REGISTERS)
    {
        to->flags |= SERVER_CTX_DEBUG_REGISTERS;
        to->debug.i386_regs.dr0 = from->Dr0;
        to->debug.i386_regs.dr1 = from->Dr1;
        to->debug.i386_regs.dr2 = from->Dr2;
        to->debug.i386_regs.dr3 = from->Dr3;
        to->debug.i386_regs.dr6 = from->Dr6;
        to->debug.i386_regs.dr7 = from->Dr7;
    }
    if (flags & CONTEXT_EXTENDED_REGISTERS)
    {
        to->flags |= SERVER_CTX_EXTENDED_REGISTERS;
        memcpy( to->ext.i386_regs, from->ExtendedRegisters, sizeof(to->ext.i386_regs) );
    }
    return STATUS_SUCCESS;
}


/***********************************************************************
 *           context_from_server
 *
 * Convert a register context from the server format.
 */
NTSTATUS context_from_server( CONTEXT *to, const context_t *from )
{
    if (from->cpu != CPU_x86) return STATUS_INVALID_PARAMETER;

    to->ContextFlags = CONTEXT_i386;
    if (from->flags & SERVER_CTX_CONTROL)
    {
        to->ContextFlags |= CONTEXT_CONTROL;
        to->Ebp    = from->ctl.i386_regs.ebp;
        to->Esp    = from->ctl.i386_regs.esp;
        to->Eip    = from->ctl.i386_regs.eip;
        to->SegCs  = from->ctl.i386_regs.cs;
        to->SegSs  = from->ctl.i386_regs.ss;
        to->EFlags = from->ctl.i386_regs.eflags;
    }
    if (from->flags & SERVER_CTX_INTEGER)
    {
        to->ContextFlags |= CONTEXT_INTEGER;
        to->Eax = from->integer.i386_regs.eax;
        to->Ebx = from->integer.i386_regs.ebx;
        to->Ecx = from->integer.i386_regs.ecx;
        to->Edx = from->integer.i386_regs.edx;
        to->Esi = from->integer.i386_regs.esi;
        to->Edi = from->integer.i386_regs.edi;
    }
    if (from->flags & SERVER_CTX_SEGMENTS)
    {
        to->ContextFlags |= CONTEXT_SEGMENTS;
        to->SegDs = from->seg.i386_regs.ds;
        to->SegEs = from->seg.i386_regs.es;
        to->SegFs = from->seg.i386_regs.fs;
        to->SegGs = from->seg.i386_regs.gs;
    }
    if (from->flags & SERVER_CTX_FLOATING_POINT)
    {
        to->ContextFlags |= CONTEXT_FLOATING_POINT;
        to->FloatSave.ControlWord   = from->fp.i386_regs.ctrl;
        to->FloatSave.StatusWord    = from->fp.i386_regs.status;
        to->FloatSave.TagWord       = from->fp.i386_regs.tag;
        to->FloatSave.ErrorOffset   = from->fp.i386_regs.err_off;
        to->FloatSave.ErrorSelector = from->fp.i386_regs.err_sel;
        to->FloatSave.DataOffset    = from->fp.i386_regs.data_off;
        to->FloatSave.DataSelector  = from->fp.i386_regs.data_sel;
        to->FloatSave.Cr0NpxState   = from->fp.i386_regs.cr0npx;
        memcpy( to->FloatSave.RegisterArea, from->fp.i386_regs.regs, sizeof(to->FloatSave.RegisterArea) );
    }
    if (from->flags & SERVER_CTX_DEBUG_REGISTERS)
    {
        to->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
        to->Dr0 = from->debug.i386_regs.dr0;
        to->Dr1 = from->debug.i386_regs.dr1;
        to->Dr2 = from->debug.i386_regs.dr2;
        to->Dr3 = from->debug.i386_regs.dr3;
        to->Dr6 = from->debug.i386_regs.dr6;
        to->Dr7 = from->debug.i386_regs.dr7;
    }
    if (from->flags & SERVER_CTX_EXTENDED_REGISTERS)
    {
        to->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
        memcpy( to->ExtendedRegisters, from->ext.i386_regs, sizeof(to->ExtendedRegisters) );
    }
    return STATUS_SUCCESS;
}


/***********************************************************************
 *           is_privileged_instr
 *
 * Check if the fault location is a privileged instruction.
 * Based on the instruction emulation code in dlls/kernel/instr.c.
 */
static inline DWORD is_privileged_instr( CONTEXT *context )
{
    const BYTE *instr;
    unsigned int prefix_count = 0;

    if (!wine_ldt_is_system( context->SegCs )) return 0;
    instr = (BYTE *)context->Eip;

    for (;;) switch(*instr)
    {
    /* instruction prefixes */
    case 0x2e:  /* %cs: */
    case 0x36:  /* %ss: */
    case 0x3e:  /* %ds: */
    case 0x26:  /* %es: */
    case 0x64:  /* %fs: */
    case 0x65:  /* %gs: */
    case 0x66:  /* opcode size */
    case 0x67:  /* addr size */
    case 0xf0:  /* lock */
    case 0xf2:  /* repne */
    case 0xf3:  /* repe */
        if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
        instr++;
        continue;

    case 0x0f: /* extended instruction */
        switch(instr[1])
        {
        case 0x20: /* mov crX, reg */
        case 0x21: /* mov drX, reg */
        case 0x22: /* mov reg, crX */
        case 0x23: /* mov reg drX */
            return EXCEPTION_PRIV_INSTRUCTION;
        }
        return 0;
    case 0x6c: /* insb (%dx) */
    case 0x6d: /* insl (%dx) */
    case 0x6e: /* outsb (%dx) */
    case 0x6f: /* outsl (%dx) */
    case 0xcd: /* int $xx */
    case 0xe4: /* inb al,XX */
    case 0xe5: /* in (e)ax,XX */
    case 0xe6: /* outb XX,al */
    case 0xe7: /* out XX,(e)ax */
    case 0xec: /* inb (%dx),%al */
    case 0xed: /* inl (%dx),%eax */
    case 0xee: /* outb %al,(%dx) */
    case 0xef: /* outl %eax,(%dx) */
    case 0xf4: /* hlt */
    case 0xfa: /* cli */
    case 0xfb: /* sti */
        return EXCEPTION_PRIV_INSTRUCTION;
    default:
        return 0;
    }
}

/***********************************************************************
 *           check_invalid_gs
 *
 * Check for fault caused by invalid %gs value (some copy protection schemes mess with it).
 */
static inline BOOL check_invalid_gs( CONTEXT *context )
{
    unsigned int prefix_count = 0;
    const BYTE *instr = (BYTE *)context->Eip;
    WORD system_gs = ntdll_get_thread_data()->gs;

    if (context->SegGs == system_gs) return FALSE;
    if (!wine_ldt_is_system( context->SegCs )) return FALSE;
    /* only handle faults in system libraries */
    if (virtual_is_valid_code_address( instr, 1 )) return FALSE;

    for (;;) switch(*instr)
    {
    /* instruction prefixes */
    case 0x2e:  /* %cs: */
    case 0x36:  /* %ss: */
    case 0x3e:  /* %ds: */
    case 0x26:  /* %es: */
    case 0x64:  /* %fs: */
    case 0x66:  /* opcode size */
    case 0x67:  /* addr size */
    case 0xf0:  /* lock */
    case 0xf2:  /* repne */
    case 0xf3:  /* repe */
        if (++prefix_count >= 15) return FALSE;
        instr++;
        continue;
    case 0x65:  /* %gs: */
        TRACE( "%04x/%04x at %p, fixing up\n", context->SegGs, system_gs, instr );
        context->SegGs = system_gs;
        return TRUE;
    default:
        return FALSE;
    }
}


#include "pshpack1.h"
struct atl_thunk
{
    DWORD movl;  /* movl this,4(%esp) */
    DWORD this;
    BYTE  jmp;   /* jmp func */
    int   func;
};
#include "poppack.h"

/**********************************************************************
 *		check_atl_thunk
 *
 * Check if code destination is an ATL thunk, and emulate it if so.
 */
static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
    BOOL ret = FALSE;

    if (!virtual_is_valid_code_address( thunk, sizeof(*thunk) )) return FALSE;

    __TRY
    {
        if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)
        {
            *((DWORD *)context->Esp + 1) = thunk->this;
            context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
            TRACE( "emulating ATL thunk at %p, func=%08x arg=%08x\n",
                   thunk, context->Eip, *((DWORD *)context->Esp + 1) );
            ret = TRUE;
        }
    }
    __EXCEPT_PAGE_FAULT
    {
        return FALSE;
    }
    __ENDTRY
    return ret;
}


/***********************************************************************
 *           setup_exception_record
 *
 * Setup the exception record and context on the thread stack.
 */
static EXCEPTION_RECORD *setup_exception_record( SIGCONTEXT *sigcontext, void *stack_ptr,
                                                 WORD fs, WORD gs, raise_func func )
{
    struct stack_layout
    {
        void             *ret_addr;      /* return address from raise_func */
        EXCEPTION_RECORD *rec_ptr;       /* first arg for raise_func */
        CONTEXT          *context_ptr;   /* second arg for raise_func */
        CONTEXT           context;
        EXCEPTION_RECORD  rec;
        DWORD             ebp;
        DWORD             eip;
    } *stack = stack_ptr;
    DWORD exception_code = 0;

    /* stack sanity checks */

    if ((char *)stack >= (char *)get_signal_stack() &&
        (char *)stack < (char *)get_signal_stack() + signal_stack_size)
    {
        WINE_ERR( "nested exception on signal stack in thread %04x eip %08x esp %08x stack %p-%p\n",
                  GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
                  (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
                  NtCurrentTeb()->Tib.StackBase );
        abort_thread(1);
    }

    if (stack - 1 > stack || /* check for overflow in subtraction */
        (char *)stack <= (char *)NtCurrentTeb()->DeallocationStack ||
        (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
    {
        WARN( "exception outside of stack limits in thread %04x eip %08x esp %08x stack %p-%p\n",
              GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
              (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
              NtCurrentTeb()->Tib.StackBase );
    }
    else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->DeallocationStack + 4096)
    {
        /* stack overflow on last page, unrecoverable */
        UINT diff = (char *)NtCurrentTeb()->DeallocationStack + 4096 - (char *)(stack - 1);
        WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
                  diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
                  (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
                  NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
        abort_thread(1);
    }
    else if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit)
    {
        /* stack access below stack limit, may be recoverable */
        if (virtual_handle_stack_fault( stack - 1 )) exception_code = EXCEPTION_STACK_OVERFLOW;
        else
        {
            UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)(stack - 1);
            WINE_ERR( "stack overflow %u bytes in thread %04x eip %08x esp %08x stack %p-%p-%p\n",
                      diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
                      (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->DeallocationStack,
                      NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
            abort_thread(1);
        }
    }

    stack--;  /* push the stack_layout structure */
#if defined(VALGRIND_MAKE_MEM_UNDEFINED)
    VALGRIND_MAKE_MEM_UNDEFINED(stack, sizeof(*stack));
#elif defined(VALGRIND_MAKE_WRITABLE)
    VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
#endif
    stack->ret_addr     = (void *)0xdeadbabe;  /* raise_func must not return */
    stack->rec_ptr      = &stack->rec;
    stack->context_ptr  = &stack->context;

    stack->rec.ExceptionRecord  = NULL;
    stack->rec.ExceptionCode    = exception_code;
    stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
    stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
    stack->rec.NumberParameters = 0;

    save_context( &stack->context, sigcontext, fs, gs );

    /* now modify the sigcontext to return to the raise function */
    ESP_sig(sigcontext) = (DWORD)stack;
    EIP_sig(sigcontext) = (DWORD)func;
    /* clear single-step, direction, and align check flag */
    EFL_sig(sigcontext) &= ~(0x100|0x400|0x40000);
    CS_sig(sigcontext)  = wine_get_cs();
    DS_sig(sigcontext)  = wine_get_ds();
    ES_sig(sigcontext)  = wine_get_es();
    FS_sig(sigcontext)  = wine_get_fs();
    GS_sig(sigcontext)  = wine_get_gs();
    SS_sig(sigcontext)  = wine_get_ss();

    return stack->rec_ptr;
}


/***********************************************************************
 *           setup_exception
 *
 * Setup a proper stack frame for the raise function, and modify the
 * sigcontext so that the return from the signal handler will call
 * the raise function.
 */
static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
{
    WORD fs, gs;
    void *stack = init_handler( sigcontext, &fs, &gs );

    return setup_exception_record( sigcontext, stack, fs, gs, func );
}


/***********************************************************************
 *           get_exception_context
 *
 * Get a pointer to the context built by setup_exception.
 */
static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
{
    return (CONTEXT *)rec - 1;  /* cf. stack_layout structure */
}


/**********************************************************************
 *		get_fpu_code
 *
 * Get the FPU exception code from the FPU status.
 */
static inline DWORD get_fpu_code( const CONTEXT *context )
{
    DWORD status = context->FloatSave.StatusWord & ~(context->FloatSave.ControlWord & 0x3f);

    if (status & 0x01)  /* IE */
    {
        if (status & 0x40)  /* SF */
            return EXCEPTION_FLT_STACK_CHECK;
        else
            return EXCEPTION_FLT_INVALID_OPERATION;
    }
    if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
    if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
    if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
    if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
    if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
    return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
}


/**********************************************************************
 *		raise_segv_exception
 */
static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    NTSTATUS status;

    switch(rec->ExceptionCode)
    {
    case EXCEPTION_ACCESS_VIOLATION:
        if (rec->NumberParameters == 2)
        {
            if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT && check_atl_thunk( rec, context ))
                goto done;
            if (rec->ExceptionInformation[1] == 0xffffffff && check_invalid_gs( context ))
                goto done;
            if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
                                                             rec->ExceptionInformation[0] )))
                goto done;
            /* send EXCEPTION_EXECUTE_FAULT only if data execution prevention is enabled */
            if (rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT)
            {
                ULONG flags;
                NtQueryInformationProcess( GetCurrentProcess(), ProcessExecuteFlags,
                                           &flags, sizeof(flags), NULL );
                if (!(flags & MEM_EXECUTE_OPTION_DISABLE))
                    rec->ExceptionInformation[0] = EXCEPTION_READ_FAULT;
            }
        }
        break;
    case EXCEPTION_DATATYPE_MISALIGNMENT:
        /* FIXME: pass through exception handler first? */
        if (context->EFlags & 0x00040000)
        {
            /* Disable AC flag, return */
            context->EFlags &= ~0x00040000;
            goto done;
        }
        break;
    }
    status = NtRaiseException( rec, context, TRUE );
    raise_status( status, rec );
done:
    set_cpu_context( context );
}


/**********************************************************************
 *		raise_trap_exception
 */
static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    NTSTATUS status;

    if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
    {
        /* when single stepping can't tell whether this is a hw bp or a
         * single step interrupt. try to avoid as much overhead as possible
         * and only do a server call if there is any hw bp enabled. */

        if( !(context->EFlags & 0x100) || (ntdll_get_thread_data()->dr7 & 0xff) )
        {
            /* (possible) hardware breakpoint, fetch the debug registers */
            DWORD saved_flags = context->ContextFlags;
            context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
            NtGetContextThread(GetCurrentThread(), context);
            context->ContextFlags |= saved_flags;  /* restore flags */
        }

        context->EFlags &= ~0x100;  /* clear single-step flag */
    }

    status = NtRaiseException( rec, context, TRUE );
    raise_status( status, rec );
}


/**********************************************************************
 *		raise_generic_exception
 *
 * Generic raise function for exceptions that don't need special treatment.
 */
static void WINAPI raise_generic_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    NTSTATUS status;

    status = NtRaiseException( rec, context, TRUE );
    raise_status( status, rec );
}


#ifdef __HAVE_VM86
/**********************************************************************
 *		raise_vm86_sti_exception
 */
static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
    get_vm86_teb_info()->vm86_pending |= VIP_FLAG;

    if (ntdll_get_thread_data()->vm86_ptr)
    {
        if (((char*)context->Eip >= (char*)vm86_return) &&
            ((char*)context->Eip <= (char*)vm86_return_end) &&
            (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
            /* exiting from VM86, can't throw */
            goto done;
        }
        merge_vm86_pending_flags( rec );
    }
    else if (get_vm86_teb_info()->dpmi_vif &&
             !wine_ldt_is_system(context->SegCs) &&
             !wine_ldt_is_system(context->SegSs))
    {
        /* Executing DPMI code and virtual interrupts are enabled. */
        get_vm86_teb_info()->vm86_pending = 0;
        NtRaiseException( rec, context, TRUE );
    }
done:
    set_cpu_context( context );
}


/**********************************************************************
 *		usr2_handler
 *
 * Handler for SIGUSR2.
 * We use it to signal that the running __wine_enter_vm86() should
 * immediately set VIP_FLAG, causing pending events to be handled
 * as early as possible.
 */
static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
    rec->ExceptionCode = EXCEPTION_VM86_STI;
}
#endif /* __HAVE_VM86 */


/**********************************************************************
 *		segv_handler
 *
 * Handler for SIGSEGV and related errors.
 */
static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    WORD fs, gs;
    EXCEPTION_RECORD *rec;
    SIGCONTEXT *context = sigcontext;
    void *stack = init_handler( sigcontext, &fs, &gs );

    /* check for page fault inside the thread stack */
    if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
        (char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
        (char *)siginfo->si_addr < (char *)NtCurrentTeb()->Tib.StackBase &&
        virtual_handle_stack_fault( siginfo->si_addr ))
    {
        /* check if this was the last guard page */
        if ((char *)siginfo->si_addr < (char *)NtCurrentTeb()->DeallocationStack + 2*4096)
        {
            rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
            rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
        }
        return;
    }

    rec = setup_exception_record( context, stack, fs, gs, raise_segv_exception );
    if (rec->ExceptionCode == EXCEPTION_STACK_OVERFLOW) return;

    switch(get_trap_code(context))
    {
    case TRAP_x86_OFLOW:   /* Overflow exception */
        rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
        break;
    case TRAP_x86_BOUND:   /* Bound range exception */
        rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
        break;
    case TRAP_x86_PRIVINFLT:   /* Invalid opcode exception */
        rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
        break;
    case TRAP_x86_STKFLT:  /* Stack fault */
        rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
        break;
    case TRAP_x86_SEGNPFLT:  /* Segment not present exception */
    case TRAP_x86_PROTFLT:   /* General protection fault */
    case TRAP_x86_UNKNOWN:   /* Unknown fault code */
        {
            WORD err = get_error_code(context);
            if (!err && (rec->ExceptionCode = is_privileged_instr( get_exception_context(rec) ))) break;
            rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
            rec->NumberParameters = 2;
            rec->ExceptionInformation[0] = 0;
            /* if error contains a LDT selector, use that as fault address */
            if ((err & 7) == 4 && !wine_ldt_is_system( err | 7 ))
                rec->ExceptionInformation[1] = err & ~7;
            else
                rec->ExceptionInformation[1] = 0xffffffff;
        }
        break;
    case TRAP_x86_PAGEFLT:  /* Page fault */
        rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
        rec->NumberParameters = 2;
        rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
        rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
        break;
    case TRAP_x86_ALIGNFLT:  /* Alignment check exception */
        rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
        break;
    default:
        WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
        /* fall through */
    case TRAP_x86_NMI:       /* NMI interrupt */
    case TRAP_x86_DNA:       /* Device not available exception */
    case TRAP_x86_DOUBLEFLT: /* Double fault exception */
    case TRAP_x86_TSSFLT:    /* Invalid TSS exception */
    case TRAP_x86_MCHK:      /* Machine check exception */
    case TRAP_x86_CACHEFLT:  /* Cache flush exception */
        rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
        break;
    }
}


/**********************************************************************
 *		trap_handler
 *
 * Handler for SIGTRAP.
 */
static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    SIGCONTEXT *context = sigcontext;
    EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );

    switch(get_trap_code(context))
    {
    case TRAP_x86_TRCTRAP:  /* Single-step exception */
        rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
        break;
    case TRAP_x86_BPTFLT:   /* Breakpoint exception */
        rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1;  /* back up over the int3 instruction */
        /* fall through */
    default:
        rec->ExceptionCode = EXCEPTION_BREAKPOINT;
        break;
    }
}


/**********************************************************************
 *		fpe_handler
 *
 * Handler for SIGFPE.
 */
static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    CONTEXT *win_context;
    SIGCONTEXT *context = sigcontext;
    EXCEPTION_RECORD *rec = setup_exception( context, raise_generic_exception );

    win_context = get_exception_context( rec );

    switch(get_trap_code(context))
    {
    case TRAP_x86_DIVIDE:   /* Division by zero exception */
        rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
        break;
    case TRAP_x86_FPOPFLT:   /* Coprocessor segment overrun */
        rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
        break;
    case TRAP_x86_ARITHTRAP:  /* Floating point exception */
    case TRAP_x86_UNKNOWN:    /* Unknown fault code */
        rec->ExceptionCode = get_fpu_code( win_context );
        rec->ExceptionAddress = (LPVOID)win_context->FloatSave.ErrorOffset;
        break;
    case TRAP_x86_CACHEFLT:  /* SIMD exception */
        /* TODO:
         * Behaviour only tested for divide-by-zero exceptions
         * Check for other SIMD exceptions as well */
        if(siginfo->si_code != FPE_FLTDIV)
            FIXME("untested SIMD exception: %#x. Might not work correctly\n",
                  siginfo->si_code);

        rec->ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
        rec->NumberParameters = 1;
        /* no idea what meaning is actually behind this but that's what native does */
        rec->ExceptionInformation[0] = 0;
        break;
    default:
        WINE_ERR( "Got unexpected trap %d\n", get_trap_code(context) );
        rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
        break;
    }
}


/**********************************************************************
 *		int_handler
 *
 * Handler for SIGINT.
 *
 * FIXME: should not be calling external functions on the signal stack.
 */
static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    WORD fs, gs;
    init_handler( sigcontext, &fs, &gs );
    if (!dispatch_signal(SIGINT))
    {
        EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
        rec->ExceptionCode = CONTROL_C_EXIT;
    }
}

/**********************************************************************
 *		abrt_handler
 *
 * Handler for SIGABRT.
 */
static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_generic_exception );
    rec->ExceptionCode  = EXCEPTION_WINE_ASSERTION;
    rec->ExceptionFlags = EH_NONCONTINUABLE;
}


/**********************************************************************
 *		quit_handler
 *
 * Handler for SIGQUIT.
 */
static void quit_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    WORD fs, gs;
    init_handler( sigcontext, &fs, &gs );
    abort_thread(0);
}


/**********************************************************************
 *		usr1_handler
 *
 * Handler for SIGUSR1, used to signal a thread that it got suspended.
 */
static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
{
    CONTEXT context;
    WORD fs, gs;

    init_handler( sigcontext, &fs, &gs );
    save_context( &context, sigcontext, fs, gs );
    wait_suspend( &context );
    restore_context( &context, sigcontext );
}


/***********************************************************************
 *           __wine_set_signal_handler   (NTDLL.@)
 */
int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
{
    if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
    if (handlers[sig] != NULL) return -2;
    handlers[sig] = wsh;
    return 0;
}


/***********************************************************************
 *           locking for LDT routines
 */
static RTL_CRITICAL_SECTION ldt_section;
static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
{
    0, 0, &ldt_section,
    { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
      0, 0, { (DWORD_PTR)(__FILE__ ": ldt_section") }
};
static RTL_CRITICAL_SECTION ldt_section = { &critsect_debug, -1, 0, 0, 0, 0 };
static sigset_t ldt_sigset;

static void ldt_lock(void)
{
    sigset_t sigset;

    pthread_sigmask( SIG_BLOCK, &server_block_set, &sigset );
    RtlEnterCriticalSection( &ldt_section );
    if (ldt_section.RecursionCount == 1) ldt_sigset = sigset;
}

static void ldt_unlock(void)
{
    if (ldt_section.RecursionCount == 1)
    {
        sigset_t sigset = ldt_sigset;
        RtlLeaveCriticalSection( &ldt_section );
        pthread_sigmask( SIG_SETMASK, &sigset, NULL );
    }
    else RtlLeaveCriticalSection( &ldt_section );
}


/**********************************************************************
 *		signal_alloc_thread
 */
NTSTATUS signal_alloc_thread( TEB **teb )
{
    static size_t sigstack_zero_bits;
    struct ntdll_thread_data *thread_data;
    struct ntdll_thread_data *parent_data = NULL;
    SIZE_T size;
    void *addr = NULL;
    NTSTATUS status;

    if (!sigstack_zero_bits)
    {
        size_t min_size = teb_size + max( MINSIGSTKSZ, 8192 );
        /* find the first power of two not smaller than min_size */
        sigstack_zero_bits = 12;
        while ((1u << sigstack_zero_bits) < min_size) sigstack_zero_bits++;
        signal_stack_mask = (1 << sigstack_zero_bits) - 1;
        signal_stack_size = (1 << sigstack_zero_bits) - teb_size;
    }
    else parent_data = ntdll_get_thread_data();

    size = signal_stack_mask + 1;
    if (!(status = NtAllocateVirtualMemory( NtCurrentProcess(), &addr, sigstack_zero_bits,
                                            &size, MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE )))
    {
        *teb = addr;
        (*teb)->Tib.Self = &(*teb)->Tib;
        (*teb)->Tib.ExceptionList = (void *)~0UL;
        thread_data = (struct ntdll_thread_data *)(*teb)->SpareBytes1;
        if (!(thread_data->fs = wine_ldt_alloc_fs()))
        {
            size = 0;
            NtFreeVirtualMemory( NtCurrentProcess(), &addr, &size, MEM_RELEASE );
            status = STATUS_TOO_MANY_THREADS;
        }
        if (parent_data)
        {
            /* inherit debug registers from parent thread */
            thread_data->dr0 = parent_data->dr0;
            thread_data->dr1 = parent_data->dr1;
            thread_data->dr2 = parent_data->dr2;
            thread_data->dr3 = parent_data->dr3;
            thread_data->dr6 = parent_data->dr6;
            thread_data->dr7 = parent_data->dr7;
        }

    }
    return status;
}


/**********************************************************************
 *		signal_free_thread
 */
void signal_free_thread( TEB *teb )
{
    SIZE_T size;
    struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;

    if (thread_data) wine_ldt_free_fs( thread_data->fs );
    if (teb->DeallocationStack)
    {
        size = 0;
        NtFreeVirtualMemory( GetCurrentProcess(), &teb->DeallocationStack, &size, MEM_RELEASE );
    }
    size = 0;
    NtFreeVirtualMemory( NtCurrentProcess(), (void **)&teb, &size, MEM_RELEASE );
}


/**********************************************************************
 *		signal_init_thread
 */
void signal_init_thread( TEB *teb )
{
    const WORD fpu_cw = 0x27f;
    struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SpareBytes1;
    LDT_ENTRY fs_entry;
    stack_t ss;

#ifdef __APPLE__
    int mib[2], val = 1;

    mib[0] = CTL_KERN;
    mib[1] = KERN_THALTSTACK;
    sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
#endif

    ss.ss_sp    = (char *)teb + teb_size;
    ss.ss_size  = signal_stack_size;
    ss.ss_flags = 0;
    if (sigaltstack(&ss, NULL) == -1) perror( "sigaltstack" );

    wine_ldt_set_base( &fs_entry, teb );
    wine_ldt_set_limit( &fs_entry, teb_size - 1 );
    wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
    wine_ldt_init_fs( thread_data->fs, &fs_entry );
    thread_data->gs = wine_get_gs();

#ifdef __GNUC__
    __asm__ volatile ("fninit; fldcw %0" : : "m" (fpu_cw));
#else
    FIXME("FPU setup not implemented for this platform.\n");
#endif
}

/**********************************************************************
 *		signal_init_process
 */
void signal_init_process(void)
{
    struct sigaction sig_act;

    sig_act.sa_mask = server_block_set;
    sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
#ifdef SA_ONSTACK
    sig_act.sa_flags |= SA_ONSTACK;
#endif

    sig_act.sa_sigaction = int_handler;
    if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
    sig_act.sa_sigaction = fpe_handler;
    if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
    sig_act.sa_sigaction = abrt_handler;
    if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
    sig_act.sa_sigaction = quit_handler;
    if (sigaction( SIGQUIT, &sig_act, NULL ) == -1) goto error;
    sig_act.sa_sigaction = usr1_handler;
    if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;

    sig_act.sa_sigaction = segv_handler;
    if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
    if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
#ifdef SIGBUS
    if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
#endif

#ifdef SIGTRAP
    sig_act.sa_sigaction = trap_handler;
    if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
#endif

#ifdef __HAVE_VM86
    sig_act.sa_sigaction = usr2_handler;
    if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
#endif

    wine_ldt_init_locking( ldt_lock, ldt_unlock );
    return;

 error:
    perror("sigaction");
    exit(1);
}


#ifdef __HAVE_VM86
/**********************************************************************
 *		__wine_enter_vm86   (NTDLL.@)
 *
 * Enter vm86 mode with the specified register context.
 */
void __wine_enter_vm86( CONTEXT *context )
{
    EXCEPTION_RECORD rec;
    int res;
    struct vm86plus_struct vm86;

    memset( &vm86, 0, sizeof(vm86) );
    for (;;)
    {
        restore_vm86_context( context, &vm86 );

        ntdll_get_thread_data()->vm86_ptr = &vm86;
        merge_vm86_pending_flags( &rec );

        res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
        if (res < 0)
        {
            errno = -res;
            return;
        }

        save_vm86_context( context, &vm86 );

        rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
        rec.ExceptionRecord  = NULL;
        rec.ExceptionAddress = (LPVOID)context->Eip;
        rec.NumberParameters = 0;

        switch(VM86_TYPE(res))
        {
        case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
            rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
            break;
        case VM86_TRAP: /* return due to DOS-debugger request */
            switch(VM86_ARG(res))
            {
            case TRAP_x86_TRCTRAP:  /* Single-step exception */
                rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
                break;
            case TRAP_x86_BPTFLT:   /* Breakpoint exception */
                rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
                /* fall through */
            default:
                rec.ExceptionCode = EXCEPTION_BREAKPOINT;
                break;
            }
            break;
        case VM86_INTx: /* int3/int x instruction (ARG = x) */
            rec.ExceptionCode = EXCEPTION_VM86_INTx;
            rec.NumberParameters = 1;
            rec.ExceptionInformation[0] = VM86_ARG(res);
            break;
        case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
            context->EFlags |= VIF_FLAG;
            context->EFlags &= ~VIP_FLAG;
            get_vm86_teb_info()->vm86_pending = 0;
            rec.ExceptionCode = EXCEPTION_VM86_STI;
            break;
        case VM86_PICRETURN: /* return due to pending PIC request */
            rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
            break;
        case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
        default:
            WINE_ERR( "unhandled result from vm86 mode %x\n", res );
            continue;
        }
        raise_exception( &rec, context, TRUE );
    }
}

#else /* __HAVE_VM86 */
/**********************************************************************
 *		__wine_enter_vm86   (NTDLL.@)
 */
void __wine_enter_vm86( CONTEXT *context )
{
    MESSAGE("vm86 mode not supported on this platform\n");
}
#endif /* __HAVE_VM86 */


/*******************************************************************
 *		RtlUnwind (NTDLL.@)
 */
void WINAPI __regs_RtlUnwind( EXCEPTION_REGISTRATION_RECORD* pEndFrame, PVOID targetIp,
                              PEXCEPTION_RECORD pRecord, PVOID retval, CONTEXT *context )
{
    EXCEPTION_RECORD record;
    EXCEPTION_REGISTRATION_RECORD *frame, *dispatch;
    DWORD res;

    context->Eax = (DWORD)retval;

    /* build an exception record, if we do not have one */
    if (!pRecord)
    {
        record.ExceptionCode    = STATUS_UNWIND;
        record.ExceptionFlags   = 0;
        record.ExceptionRecord  = NULL;
        record.ExceptionAddress = (void *)context->Eip;
        record.NumberParameters = 0;
        pRecord = &record;
    }

    pRecord->ExceptionFlags |= EH_UNWINDING | (pEndFrame ? 0 : EH_EXIT_UNWIND);

    TRACE( "code=%x flags=%x\n", pRecord->ExceptionCode, pRecord->ExceptionFlags );

    /* get chain of exception frames */
    frame = NtCurrentTeb()->Tib.ExceptionList;
    while ((frame != (EXCEPTION_REGISTRATION_RECORD*)~0UL) && (frame != pEndFrame))
    {
        /* Check frame address */
        if (pEndFrame && (frame > pEndFrame))
            raise_status( STATUS_INVALID_UNWIND_TARGET, pRecord );

        if (!is_valid_frame( frame )) raise_status( STATUS_BAD_STACK, pRecord );

        /* Call handler */
        TRACE( "calling handler at %p code=%x flags=%x\n",
               frame->Handler, pRecord->ExceptionCode, pRecord->ExceptionFlags );
        res = EXC_CallHandler( pRecord, frame, context, &dispatch, frame->Handler, unwind_handler );
        TRACE( "handler at %p returned %x\n", frame->Handler, res );

        switch(res)
        {
        case ExceptionContinueSearch:
            break;
        case ExceptionCollidedUnwind:
            frame = dispatch;
            break;
        default:
            raise_status( STATUS_INVALID_DISPOSITION, pRecord );
            break;
        }
        frame = __wine_pop_frame( frame );
    }
}
DEFINE_REGS_ENTRYPOINT( RtlUnwind, 4 )


/*******************************************************************
 *		NtRaiseException (NTDLL.@)
 */
NTSTATUS WINAPI NtRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL first_chance )
{
    NTSTATUS status = raise_exception( rec, context, first_chance );
    if (status == STATUS_SUCCESS)
    {
        set_debug_registers( context );
        set_cpu_context( context );
    }
    return status;
}


/***********************************************************************
 *		RtlRaiseException (NTDLL.@)
 */
void WINAPI __regs_RtlRaiseException( EXCEPTION_RECORD *rec, CONTEXT *context )
{
    NTSTATUS status;

    rec->ExceptionAddress = (void *)context->Eip;
    status = raise_exception( rec, context, TRUE );
    if (status != STATUS_SUCCESS) raise_status( status, rec );
}
DEFINE_REGS_ENTRYPOINT( RtlRaiseException, 1 )


/*************************************************************************
 *		RtlCaptureStackBackTrace (NTDLL.@)
 */
USHORT WINAPI RtlCaptureStackBackTrace( ULONG skip, ULONG count, PVOID *buffer, ULONG *hash )
{
    CONTEXT context;
    ULONG i;
    ULONG *frame;

    RtlCaptureContext( &context );
    if (hash) *hash = 0;
    frame = (ULONG *)context.Ebp;

    while (skip--)
    {
        if (!is_valid_frame( frame )) return 0;
        frame = (ULONG *)*frame;
    }

    for (i = 0; i < count; i++)
    {
        if (!is_valid_frame( frame )) break;
        buffer[i] = (void *)frame[1];
        if (hash) *hash += frame[1];
        frame = (ULONG *)*frame;
    }
    return i;
}


extern void DECLSPEC_NORETURN call_thread_entry_point( LPTHREAD_START_ROUTINE entry, void *arg );
__ASM_GLOBAL_FUNC( call_thread_entry_point,
                   "pushl %ebp\n\t"
                   __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
                   __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
                   "movl %esp,%ebp\n\t"
                   __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
                   "pushl %ebx\n\t"
                   __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
                   "pushl %esi\n\t"
                   __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
                   "pushl %edi\n\t"
                   __ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
                   "pushl %ebp\n\t"
                   "pushl 12(%ebp)\n\t"
                   "pushl 8(%ebp)\n\t"
                   "call " __ASM_NAME("call_thread_func") );

extern void DECLSPEC_NORETURN call_thread_exit_func( int status, void (*func)(int), void *frame );
__ASM_GLOBAL_FUNC( call_thread_exit_func,
                   "movl 4(%esp),%eax\n\t"
                   "movl 8(%esp),%ecx\n\t"
                   "movl 12(%esp),%ebp\n\t"
                   __ASM_CFI(".cfi_def_cfa %ebp,4\n\t")
                   __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
                   __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
                   __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
                   __ASM_CFI(".cfi_rel_offset %edi,-12\n\t")
                   "leal -20(%ebp),%esp\n\t"
                   "pushl %eax\n\t"
                   "call *%ecx" );

/* wrapper for apps that don't declare the thread function correctly */
extern void DECLSPEC_NORETURN call_thread_func_wrapper( LPTHREAD_START_ROUTINE entry, void *arg );
__ASM_GLOBAL_FUNC(call_thread_func_wrapper,
                  "pushl %ebp\n\t"
                  __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
                  __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
                  "movl %esp,%ebp\n\t"
                  __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
                  "subl $4,%esp\n\t"
                  "pushl 12(%ebp)\n\t"
                  "call *8(%ebp)\n\t"
                  "leal -4(%ebp),%esp\n\t"
                  "pushl %eax\n\t"
                  "call " __ASM_NAME("exit_thread") "\n\t"
                  "int $3" )

/***********************************************************************
 *           call_thread_func
 */
void call_thread_func( LPTHREAD_START_ROUTINE entry, void *arg, void *frame )
{
    ntdll_get_thread_data()->exit_frame = frame;
    __TRY
    {
        call_thread_func_wrapper( entry, arg );
    }
    __EXCEPT(unhandled_exception_filter)
    {
        NtTerminateThread( GetCurrentThread(), GetExceptionCode() );
    }
    __ENDTRY
    abort();  /* should not be reached */
}

/***********************************************************************
 *           RtlExitUserThread  (NTDLL.@)
 */
void WINAPI RtlExitUserThread( ULONG status )
{
    if (!ntdll_get_thread_data()->exit_frame) exit_thread( status );
    call_thread_exit_func( status, exit_thread, ntdll_get_thread_data()->exit_frame );
}

/***********************************************************************
 *           abort_thread
 */
void abort_thread( int status )
{
    if (!ntdll_get_thread_data()->exit_frame) terminate_thread( status );
    call_thread_exit_func( status, terminate_thread, ntdll_get_thread_data()->exit_frame );
}

/**********************************************************************
 *		DbgBreakPoint   (NTDLL.@)
 */
__ASM_STDCALL_FUNC( DbgBreakPoint, 0, "int $3; ret")

/**********************************************************************
 *		DbgUserBreakPoint   (NTDLL.@)
 */
__ASM_STDCALL_FUNC( DbgUserBreakPoint, 0, "int $3; ret")

/**********************************************************************
 *           NtCurrentTeb   (NTDLL.@)
 */
__ASM_STDCALL_FUNC( NtCurrentTeb, 0, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" )


/**************************************************************************
 *           _chkstk   (NTDLL.@)
 */
__ASM_STDCALL_FUNC( _chkstk, 0,
                   "negl %eax\n\t"
                   "addl %esp,%eax\n\t"
                   "xchgl %esp,%eax\n\t"
                   "movl 0(%eax),%eax\n\t"  /* copy return address from old location */
                   "movl %eax,0(%esp)\n\t"
                   "ret" )

/**************************************************************************
 *           _alloca_probe   (NTDLL.@)
 */
__ASM_STDCALL_FUNC( _alloca_probe, 0,
                   "negl %eax\n\t"
                   "addl %esp,%eax\n\t"
                   "xchgl %esp,%eax\n\t"
                   "movl 0(%eax),%eax\n\t"  /* copy return address from old location */
                   "movl %eax,0(%esp)\n\t"
                   "ret" )


/**********************************************************************
 *		EXC_CallHandler   (internal)
 *
 * Some exception handlers depend on EBP to have a fixed position relative to
 * the exception frame.
 * Shrinker depends on (*1) doing what it does,
 * (*2) being the exact instruction it is and (*3) beginning with 0x64
 * (i.e. the %fs prefix to the movl instruction). It also depends on the
 * function calling the handler having only 5 parameters (*4).
 */
__ASM_GLOBAL_FUNC( EXC_CallHandler,
                  "pushl %ebp\n\t"
                  __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
                  __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
                  "movl %esp,%ebp\n\t"
                  __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
                   "pushl %ebx\n\t"
                   __ASM_CFI(".cfi_rel_offset %ebx,-4\n\t")
                   "movl 28(%ebp), %edx\n\t" /* ugly hack to pass the 6th param needed because of Shrinker */
                   "pushl 24(%ebp)\n\t"
                   "pushl 20(%ebp)\n\t"
                   "pushl 16(%ebp)\n\t"
                   "pushl 12(%ebp)\n\t"
                   "pushl 8(%ebp)\n\t"
                   "call " __ASM_NAME("call_exception_handler") "\n\t"
                   "popl %ebx\n\t"
                   __ASM_CFI(".cfi_same_value %ebx\n\t")
                   "leave\n"
                   __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
                   __ASM_CFI(".cfi_same_value %ebp\n\t")
                   "ret" )
__ASM_GLOBAL_FUNC(call_exception_handler,
                  "pushl %ebp\n\t"
                  __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
                  __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
                  "movl %esp,%ebp\n\t"
                  __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
                  "subl $12,%esp\n\t"
                  "pushl 12(%ebp)\n\t"      /* make any exceptions in this... */
                  "pushl %edx\n\t"          /* handler be handled by... */
                  ".byte 0x64\n\t"
                  "pushl (0)\n\t"           /* nested_handler (passed in edx). */
                  ".byte 0x64\n\t"
                  "movl %esp,(0)\n\t"       /* push the new exception frame onto the exception stack. */
                  "pushl 20(%ebp)\n\t"
                  "pushl 16(%ebp)\n\t"
                  "pushl 12(%ebp)\n\t"
                  "pushl 8(%ebp)\n\t"
                  "movl 24(%ebp), %ecx\n\t" /* (*1) */
                  "call *%ecx\n\t"          /* call handler. (*2) */
                  ".byte 0x64\n\t"
                  "movl (0), %esp\n\t"      /* restore previous... (*3) */
                  ".byte 0x64\n\t"
                  "popl (0)\n\t"            /* exception frame. */
                  "movl %ebp, %esp\n\t"     /* restore saved stack, in case it was corrupted */
                  "popl %ebp\n\t"
                   __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
                   __ASM_CFI(".cfi_same_value %ebp\n\t")
                  "ret $20" )            /* (*4) */

#endif  /* __i386__ */