dlls/ntdll/signal_i386.c

   1 /*
   2  * i386 signal handling routines
   3  *
   4  * Copyright 1999 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifdef __i386__
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <errno.h>
  27 #include <signal.h>
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #ifdef HAVE_UNISTD_H
  31 # include <unistd.h>
  32 #endif
  33
  34 #ifdef HAVE_SYS_PARAM_H
  35 # include <sys/param.h>
  36 #endif
  37 #ifdef HAVE_SYSCALL_H
  38 # include <syscall.h>
  39 #else
  40 # ifdef HAVE_SYS_SYSCALL_H
  41 #  include <sys/syscall.h>
  42 # endif
  43 #endif
  44
  45 #ifdef HAVE_SYS_VM86_H
  46 # include <sys/vm86.h>
  47 #endif
  48
  49 #ifdef HAVE_SYS_SIGNAL_H
  50 # include <sys/signal.h>
  51 #endif
  52
  53 #include "windef.h"
  54 #include "winternl.h"
  55 #include "wine/library.h"
  56
  57 #include "selectors.h"
  58
  59 /***********************************************************************
  60  * signal context platform-specific definitions
  61  */
  62
  63 #ifdef linux
  64 typedef struct
  65 {
  66     unsigned short sc_gs, __gsh;
  67     unsigned short sc_fs, __fsh;
  68     unsigned short sc_es, __esh;
  69     unsigned short sc_ds, __dsh;
  70     unsigned long sc_edi;
  71     unsigned long sc_esi;
  72     unsigned long sc_ebp;
  73     unsigned long sc_esp;
  74     unsigned long sc_ebx;
  75     unsigned long sc_edx;
  76     unsigned long sc_ecx;
  77     unsigned long sc_eax;
  78     unsigned long sc_trapno;
  79     unsigned long sc_err;
  80     unsigned long sc_eip;
  81     unsigned short sc_cs, __csh;
  82     unsigned long sc_eflags;
  83     unsigned long esp_at_signal;
  84     unsigned short sc_ss, __ssh;
  85     unsigned long i387;
  86     unsigned long oldmask;
  87     unsigned long cr2;
  88 } SIGCONTEXT;
  89
  90 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
  91 #define HANDLER_CONTEXT (&__context)
  92
  93 /* this is the sigaction structure from the Linux 2.1.20 kernel.  */
  94 struct kernel_sigaction
  95 {
  96     void (*ksa_handler)();
  97     unsigned long ksa_mask;
  98     unsigned long ksa_flags;
  99     void *ksa_restorer;
 100 };
 101
 102 /* Similar to the sigaction function in libc, except it leaves alone the
 103    restorer field, which is used to specify the signal stack address */
 104 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
 105                                   struct kernel_sigaction *old )
 106 {
 107     __asm__ __volatile__( "pushl %%ebx\n\t"
 108                           "movl %2,%%ebx\n\t"
 109                           "int $0x80\n\t"
 110                           "popl %%ebx"
 111                           : "=a" (sig)
 112                           : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
 113     if (sig>=0) return 0;
 114     errno = -sig;
 115     return -1;
 116 }
 117
 118 #ifdef HAVE_SIGALTSTACK
 119 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
 120 static inline int wine_sigaltstack( const struct sigaltstack *new,
 121                                     struct sigaltstack *old )
 122 {
 123     int ret;
 124     __asm__ __volatile__( "pushl %%ebx\n\t"
 125                           "movl %2,%%ebx\n\t"
 126                           "int $0x80\n\t"
 127                           "popl %%ebx"
 128                           : "=a" (ret)
 129                           : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
 130     if (ret >= 0) return 0;
 131     errno = -ret;
 132     return -1;
 133 }
 134 #endif
 135
 136 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
 137
 138 int vm86_enter( void **vm86_ptr );
 139 void vm86_return(void);
 140 void vm86_return_end(void);
 141 __ASM_GLOBAL_FUNC(vm86_enter,
 142                   "pushl %ebp\n\t"
 143                   "movl %esp, %ebp\n\t"
 144                   "movl $166,%eax\n\t"  /*SYS_vm86*/
 145                   "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
 146                   "movl (%ecx),%ecx\n\t"
 147                   "pushl %ebx\n\t"
 148                   "movl $1,%ebx\n\t"    /*VM86_ENTER*/
 149                   "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
 150                   "pushl %fs\n\t"
 151                   "int $0x80\n"
 152                   ".globl " __ASM_NAME("vm86_return") "\n\t"
 153                   __ASM_FUNC("vm86_return") "\n"
 154                   __ASM_NAME("vm86_return") ":\n\t"
 155                   "popl %fs\n\t"
 156                   "popl %ecx\n\t"
 157                   "popl %ebx\n\t"
 158                   "popl %ebp\n\t"
 159                   "testl %eax,%eax\n\t"
 160                   "jl 0f\n\t"
 161                   "cmpb $0,%al\n\t" /* VM86_SIGNAL */
 162                   "je " __ASM_NAME("vm86_enter") "\n\t"
 163                   "0:\n\t"
 164                   "movl 4(%esp),%ecx\n\t"  /* vm86_ptr */
 165                   "movl $0,(%ecx)\n\t"
 166                   ".globl " __ASM_NAME("vm86_return_end") "\n\t"
 167                   __ASM_FUNC("vm86_return_end") "\n"
 168                   __ASM_NAME("vm86_return_end") ":\n\t"
 169                   "ret" );
 170
 171 #ifdef HAVE_SYS_VM86_H
 172 # define __HAVE_VM86
 173 #endif
 174
 175 #endif  /* linux */
 176
 177 #ifdef BSDI
 178
 179 #define EAX_sig(context)     ((context)->tf_eax)
 180 #define EBX_sig(context)     ((context)->tf_ebx)
 181 #define ECX_sig(context)     ((context)->tf_ecx)
 182 #define EDX_sig(context)     ((context)->tf_edx)
 183 #define ESI_sig(context)     ((context)->tf_esi)
 184 #define EDI_sig(context)     ((context)->tf_edi)
 185 #define EBP_sig(context)     ((context)->tf_ebp)
 186
 187 #define CS_sig(context)      ((context)->tf_cs)
 188 #define DS_sig(context)      ((context)->tf_ds)
 189 #define ES_sig(context)      ((context)->tf_es)
 190 #define SS_sig(context)      ((context)->tf_ss)
 191
 192 #include <machine/frame.h>
 193 typedef struct trapframe SIGCONTEXT;
 194
 195 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 196 #define HANDLER_CONTEXT __context
 197
 198 #define EFL_sig(context)     ((context)->tf_eflags)
 199
 200 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 201 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 202
 203 #endif /* bsdi */
 204
 205 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 206
 207 typedef struct sigcontext SIGCONTEXT;
 208
 209 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 210 #define HANDLER_CONTEXT __context
 211
 212 #endif  /* FreeBSD */
 213
 214 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 215
 216 #ifdef _SCO_DS
 217 #include <sys/regset.h>
 218 #endif
 219 /* Solaris kludge */
 220 #undef ERR
 221 #include <sys/ucontext.h>
 222 #undef ERR
 223 typedef struct ucontext SIGCONTEXT;
 224
 225 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
 226 #define HANDLER_CONTEXT __context
 227
 228 #endif  /* svr4 || SCO_DS */
 229
 230 #ifdef __EMX__
 231
 232 typedef struct
 233 {
 234     unsigned long ContextFlags;
 235     FLOATING_SAVE_AREA sc_float;
 236     unsigned long sc_gs;
 237     unsigned long sc_fs;
 238     unsigned long sc_es;
 239     unsigned long sc_ds;
 240     unsigned long sc_edi;
 241     unsigned long sc_esi;
 242     unsigned long sc_eax;
 243     unsigned long sc_ebx;
 244     unsigned long sc_ecx;
 245     unsigned long sc_edx;
 246     unsigned long sc_ebp;
 247     unsigned long sc_eip;
 248     unsigned long sc_cs;
 249     unsigned long sc_eflags;
 250     unsigned long sc_esp;
 251     unsigned long sc_ss;
 252 } SIGCONTEXT;
 253
 254 #endif  /* __EMX__ */
 255
 256 #ifdef __CYGWIN__
 257
 258 /* FIXME: This section is just here so it can compile, it's most likely
 259  * completely wrong. */
 260
 261 typedef struct
 262 {
 263     unsigned short sc_gs, __gsh;
 264     unsigned short sc_fs, __fsh;
 265     unsigned short sc_es, __esh;
 266     unsigned short sc_ds, __dsh;
 267     unsigned long sc_edi;
 268     unsigned long sc_esi;
 269     unsigned long sc_ebp;
 270     unsigned long sc_esp;
 271     unsigned long sc_ebx;
 272     unsigned long sc_edx;
 273     unsigned long sc_ecx;
 274     unsigned long sc_eax;
 275     unsigned long sc_trapno;
 276     unsigned long sc_err;
 277     unsigned long sc_eip;
 278     unsigned short sc_cs, __csh;
 279     unsigned long sc_eflags;
 280     unsigned long esp_at_signal;
 281     unsigned short sc_ss, __ssh;
 282     unsigned long i387;
 283     unsigned long oldmask;
 284     unsigned long cr2;
 285 } SIGCONTEXT;
 286
 287 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
 288 #define HANDLER_CONTEXT (&__context)
 289
 290 #endif /* __CYGWIN__ */
 291
 292 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
 293     defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
 294
 295 #define EAX_sig(context)     ((context)->sc_eax)
 296 #define EBX_sig(context)     ((context)->sc_ebx)
 297 #define ECX_sig(context)     ((context)->sc_ecx)
 298 #define EDX_sig(context)     ((context)->sc_edx)
 299 #define ESI_sig(context)     ((context)->sc_esi)
 300 #define EDI_sig(context)     ((context)->sc_edi)
 301 #define EBP_sig(context)     ((context)->sc_ebp)
 302
 303 #define CS_sig(context)      ((context)->sc_cs)
 304 #define DS_sig(context)      ((context)->sc_ds)
 305 #define ES_sig(context)      ((context)->sc_es)
 306 #define SS_sig(context)      ((context)->sc_ss)
 307
 308 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
 309  * saved by the exception handling. duh.
 310  * Actually they are in -current (have been for a while), and that
 311  * patch now finally has been MFC'd to -stable too (Nov 15 1999).
 312  * If you're running a system from the -stable branch older than that,
 313  * like a 3.3-RELEASE, grab the patch from the ports tree:
 314  * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
 315  * (If its not yet there when you look, go here:
 316  * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
 317  */
 318 #ifdef __FreeBSD__
 319 #define FS_sig(context)      ((context)->sc_fs)
 320 #define GS_sig(context)      ((context)->sc_gs)
 321 #endif
 322
 323 #ifdef linux
 324 #define FS_sig(context)      ((context)->sc_fs)
 325 #define GS_sig(context)      ((context)->sc_gs)
 326 #define CR2_sig(context)     ((context)->cr2)
 327 #define TRAP_sig(context)    ((context)->sc_trapno)
 328 #define ERROR_sig(context)   ((context)->sc_err)
 329 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 330 #endif
 331
 332 #ifndef __FreeBSD__
 333 #define EFL_sig(context)     ((context)->sc_eflags)
 334 #else
 335 #define EFL_sig(context)     ((context)->sc_efl)
 336 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 337 #define CR2_sig(context)     ((context)->sc_err)
 338 #define TRAP_sig(context)    ((context)->sc_trapno)
 339 #endif
 340
 341 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 342 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 343
 344 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 345
 346 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 347
 348 #ifdef _SCO_DS
 349 #define gregs regs
 350 #endif
 351
 352 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 353 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 354 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 355 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 356 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 357 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 358 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 359
 360 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 361 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 362 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 363 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 364
 365 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 366 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 367
 368 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 369
 370 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 371 #ifdef R_ESP
 372 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 373 #else
 374 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 375 #endif
 376 #ifdef TRAPNO
 377 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 378 #endif
 379
 380 #endif  /* svr4 || SCO_DS */
 381
 382
 383 /* exception code definitions (already defined by FreeBSD/NetBSD) */
 384 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
 385 #define T_DIVIDE        0   /* Division by zero exception */
 386 #define T_TRCTRAP       1   /* Single-step exception */
 387 #define T_NMI           2   /* NMI interrupt */
 388 #define T_BPTFLT        3   /* Breakpoint exception */
 389 #define T_OFLOW         4   /* Overflow exception */
 390 #define T_BOUND         5   /* Bound range exception */
 391 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 392 #define T_DNA           7   /* Device not available exception */
 393 #define T_DOUBLEFLT     8   /* Double fault exception */
 394 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 395 #define T_TSSFLT        10  /* Invalid TSS exception */
 396 #define T_SEGNPFLT      11  /* Segment not present exception */
 397 #define T_STKFLT        12  /* Stack fault */
 398 #define T_PROTFLT       13  /* General protection fault */
 399 #define T_PAGEFLT       14  /* Page fault */
 400 #define T_RESERVED      15  /* Unknown exception */
 401 #define T_ARITHTRAP     16  /* Floating point exception */
 402 #define T_ALIGNFLT      17  /* Alignment check exception */
 403 #define T_MCHK          18  /* Machine check exception */
 404 #define T_CACHEFLT      19  /* Cache flush exception */
 405 #endif
 406 #if defined(__NetBSD__)
 407 #define T_MCHK          19  /* Machine check exception */
 408 #endif
 409
 410 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 411
 412 #include "wine/exception.h"
 413 #include "stackframe.h"
 414 #include "global.h"
 415 #include "miscemu.h"
 416 #include "syslevel.h"
 417 #include "wine/debug.h"
 418
 419 WINE_DEFAULT_DEBUG_CHANNEL(seh);
 420
 421 typedef int (*wine_signal_handler)(unsigned int sig);
 422
 423 static wine_signal_handler handlers[256];
 424
 425 static sigset_t all_sigs;
 426
 427 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
 428
 429 /***********************************************************************
 430  *           dispatch_signal
 431  */
 432 inline static int dispatch_signal(unsigned int sig)
 433 {
 434     if (handlers[sig] == NULL) return 0;
 435     return handlers[sig](sig);
 436 }
 437
 438
 439 /***********************************************************************
 440  *           get_trap_code
 441  *
 442  * Get the trap code for a signal.
 443  */
 444 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 445 {
 446 #ifdef TRAP_sig
 447     return TRAP_sig(sigcontext);
 448 #else
 449     return T_UNKNOWN;  /* unknown trap code */
 450 #endif
 451 }
 452
 453 /***********************************************************************
 454  *           get_error_code
 455  *
 456  * Get the error code for a signal.
 457  */
 458 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 459 {
 460 #ifdef ERROR_sig
 461     return ERROR_sig(sigcontext);
 462 #else
 463     return 0;
 464 #endif
 465 }
 466
 467 /***********************************************************************
 468  *           get_cr2_value
 469  *
 470  * Get the CR2 value for a signal.
 471  */
 472 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
 473 {
 474 #ifdef CR2_sig
 475     return (void *)CR2_sig(sigcontext);
 476 #else
 477     return NULL;
 478 #endif
 479 }
 480
 481
 482 #ifdef __HAVE_VM86
 483 /***********************************************************************
 484  *           save_vm86_context
 485  *
 486  * Set the register values from a vm86 structure.
 487  */
 488 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 489 {
 490     context->Eax    = vm86->regs.eax;
 491     context->Ebx    = vm86->regs.ebx;
 492     context->Ecx    = vm86->regs.ecx;
 493     context->Edx    = vm86->regs.edx;
 494     context->Esi    = vm86->regs.esi;
 495     context->Edi    = vm86->regs.edi;
 496     context->Esp    = vm86->regs.esp;
 497     context->Ebp    = vm86->regs.ebp;
 498     context->Eip    = vm86->regs.eip;
 499     context->SegCs  = vm86->regs.cs;
 500     context->SegDs  = vm86->regs.ds;
 501     context->SegEs  = vm86->regs.es;
 502     context->SegFs  = vm86->regs.fs;
 503     context->SegGs  = vm86->regs.gs;
 504     context->SegSs  = vm86->regs.ss;
 505     context->EFlags = vm86->regs.eflags;
 506 }
 507
 508
 509 /***********************************************************************
 510  *           restore_vm86_context
 511  *
 512  * Build a vm86 structure from the register values.
 513  */
 514 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 515 {
 516     vm86->regs.eax    = context->Eax;
 517     vm86->regs.ebx    = context->Ebx;
 518     vm86->regs.ecx    = context->Ecx;
 519     vm86->regs.edx    = context->Edx;
 520     vm86->regs.esi    = context->Esi;
 521     vm86->regs.edi    = context->Edi;
 522     vm86->regs.esp    = context->Esp;
 523     vm86->regs.ebp    = context->Ebp;
 524     vm86->regs.eip    = context->Eip;
 525     vm86->regs.cs     = context->SegCs;
 526     vm86->regs.ds     = context->SegDs;
 527     vm86->regs.es     = context->SegEs;
 528     vm86->regs.fs     = context->SegFs;
 529     vm86->regs.gs     = context->SegGs;
 530     vm86->regs.ss     = context->SegSs;
 531     vm86->regs.eflags = context->EFlags;
 532 }
 533 #endif /* __HAVE_VM86 */
 534
 535
 536 /***********************************************************************
 537  *           save_context
 538  *
 539  * Set the register values from a sigcontext.
 540  */
 541 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 542 {
 543     WORD fs;
 544     /* get %fs at time of the fault */
 545 #ifdef FS_sig
 546     fs = FS_sig(sigcontext);
 547 #else
 548     fs = wine_get_fs();
 549 #endif
 550     context->SegFs = fs;
 551
 552     /* now restore a proper %fs for the fault handler */
 553     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
 554         !IS_SELECTOR_SYSTEM(SS_sig(sigcontext)))  /* 16-bit mode */
 555     {
 556         /*
 557          * Win16 or DOS protected mode. Note that during switch
 558          * from 16-bit mode to linear mode, CS may be set to system
 559          * segment before FS is restored. Fortunately, in this case
 560          * SS is still non-system segment. This is why both CS and SS
 561          * are checked.
 562          */
 563         fs = SYSLEVEL_Win16CurrentTeb;
 564     }
 565 #ifdef __HAVE_VM86
 566     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 567     {
 568         /* fetch the saved %fs on the stack */
 569         fs = *(unsigned int *)ESP_sig(sigcontext);
 570         if (EAX_sig(sigcontext) == VM86_EAX) {
 571             struct vm86plus_struct *vm86;
 572             wine_set_fs(fs);
 573             /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 574              * (but we could also get if from teb->vm86_ptr) */
 575             vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
 576             /* get context from vm86 struct */
 577             save_vm86_context( context, vm86 );
 578             return;
 579         }
 580     }
 581 #endif  /* __HAVE_VM86 */
 582
 583     wine_set_fs(fs);
 584
 585     context->Eax    = EAX_sig(sigcontext);
 586     context->Ebx    = EBX_sig(sigcontext);
 587     context->Ecx    = ECX_sig(sigcontext);
 588     context->Edx    = EDX_sig(sigcontext);
 589     context->Esi    = ESI_sig(sigcontext);
 590     context->Edi    = EDI_sig(sigcontext);
 591     context->Ebp    = EBP_sig(sigcontext);
 592     context->EFlags = EFL_sig(sigcontext);
 593     context->Eip    = EIP_sig(sigcontext);
 594     context->Esp    = ESP_sig(sigcontext);
 595     context->SegCs  = LOWORD(CS_sig(sigcontext));
 596     context->SegDs  = LOWORD(DS_sig(sigcontext));
 597     context->SegEs  = LOWORD(ES_sig(sigcontext));
 598     context->SegSs  = LOWORD(SS_sig(sigcontext));
 599 #ifdef GS_sig
 600     context->SegGs  = LOWORD(GS_sig(sigcontext));
 601 #else
 602     context->SegGs  = wine_get_gs();
 603 #endif
 604 }
 605
 606
 607 /***********************************************************************
 608  *           restore_context
 609  *
 610  * Build a sigcontext from the register values.
 611  */
 612 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 613 {
 614 #ifdef __HAVE_VM86
 615     /* check if exception occurred in vm86 mode */
 616     if ((void *)EIP_sig(sigcontext) == vm86_return &&
 617         IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
 618         EAX_sig(sigcontext) == VM86_EAX)
 619     {
 620         /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 621          * (but we could also get it from teb->vm86_ptr) */
 622         struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
 623         restore_vm86_context( context, vm86 );
 624         return;
 625     }
 626 #endif /* __HAVE_VM86 */
 627
 628     EAX_sig(sigcontext) = context->Eax;
 629     EBX_sig(sigcontext) = context->Ebx;
 630     ECX_sig(sigcontext) = context->Ecx;
 631     EDX_sig(sigcontext) = context->Edx;
 632     ESI_sig(sigcontext) = context->Esi;
 633     EDI_sig(sigcontext) = context->Edi;
 634     EBP_sig(sigcontext) = context->Ebp;
 635     EFL_sig(sigcontext) = context->EFlags;
 636     EIP_sig(sigcontext) = context->Eip;
 637     ESP_sig(sigcontext) = context->Esp;
 638     CS_sig(sigcontext)  = context->SegCs;
 639     DS_sig(sigcontext)  = context->SegDs;
 640     ES_sig(sigcontext)  = context->SegEs;
 641     SS_sig(sigcontext)  = context->SegSs;
 642 #ifdef FS_sig
 643     FS_sig(sigcontext)  = context->SegFs;
 644 #else
 645     wine_set_fs( context->SegFs );
 646 #endif
 647 #ifdef GS_sig
 648     GS_sig(sigcontext)  = context->SegGs;
 649 #else
 650     wine_set_gs( context->SegGs );
 651 #endif
 652 }
 653
 654
 655 /***********************************************************************
 656  *           save_fpu
 657  *
 658  * Set the FPU context from a sigcontext.
 659  */
 660 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 661 {
 662 #ifdef FPU_sig
 663     if (FPU_sig(sigcontext))
 664     {
 665         context->FloatSave = *FPU_sig(sigcontext);
 666         return;
 667     }
 668 #endif  /* FPU_sig */
 669 #ifdef __GNUC__
 670     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 671 #endif  /* __GNUC__ */
 672 }
 673
 674
 675 /***********************************************************************
 676  *           restore_fpu
 677  *
 678  * Restore the FPU context to a sigcontext.
 679  */
 680 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 681 {
 682     /* reset the current interrupt status */
 683     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 684 #ifdef FPU_sig
 685     if (FPU_sig(sigcontext))
 686     {
 687         *FPU_sig(sigcontext) = context->FloatSave;
 688         return;
 689     }
 690 #endif  /* FPU_sig */
 691 #ifdef __GNUC__
 692     /* avoid nested exceptions */
 693     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 694 #endif  /* __GNUC__ */
 695 }
 696
 697
 698 /**********************************************************************
 699  *              get_fpu_code
 700  *
 701  * Get the FPU exception code from the FPU status.
 702  */
 703 static inline DWORD get_fpu_code( const CONTEXT *context )
 704 {
 705     DWORD status = context->FloatSave.StatusWord;
 706
 707     if (status & 0x01)  /* IE */
 708     {
 709         if (status & 0x40)  /* SF */
 710             return EXCEPTION_FLT_STACK_CHECK;
 711         else
 712             return EXCEPTION_FLT_INVALID_OPERATION;
 713     }
 714     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 715     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 716     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 717     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 718     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 719     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 720 }
 721
 722
 723 /***********************************************************************
 724  *           SIGNAL_Unblock
 725  *
 726  * Unblock signals. Called from EXC_RtlRaiseException.
 727  */
 728 void SIGNAL_Unblock( void )
 729 {
 730     sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
 731 }
 732
 733
 734 /**********************************************************************
 735  *              do_segv
 736  *
 737  * Implementation of SIGSEGV handler.
 738  */
 739 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
 740 {
 741     EXCEPTION_RECORD rec;
 742     DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
 743
 744 #ifdef CR2_sig
 745     /* we want the page-fault case to be fast */
 746     if (trap_code == T_PAGEFLT)
 747         if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
 748 #endif
 749
 750     rec.ExceptionRecord  = NULL;
 751     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 752     rec.ExceptionAddress = (LPVOID)context->Eip;
 753     rec.NumberParameters = 0;
 754
 755     switch(trap_code)
 756     {
 757     case T_OFLOW:   /* Overflow exception */
 758         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 759         break;
 760     case T_BOUND:   /* Bound range exception */
 761         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 762         break;
 763     case T_PRIVINFLT:   /* Invalid opcode exception */
 764         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 765         break;
 766     case T_STKFLT:  /* Stack fault */
 767         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 768         break;
 769     case T_SEGNPFLT:  /* Segment not present exception */
 770     case T_PROTFLT:   /* General protection fault */
 771     case T_UNKNOWN:   /* Unknown fault code */
 772         if (INSTR_EmulateInstruction( context )) return;
 773         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 774         break;
 775     case T_PAGEFLT:  /* Page fault */
 776 #ifdef CR2_sig
 777         rec.NumberParameters = 2;
 778         rec.ExceptionInformation[0] = (err_code & 2) != 0;
 779         rec.ExceptionInformation[1] = (DWORD)cr2;
 780 #endif /* CR2_sig */
 781         rec.ExceptionCode = page_fault_code;
 782         break;
 783     case T_ALIGNFLT:  /* Alignment check exception */
 784         /* FIXME: pass through exception handler first? */
 785         if (context->EFlags & 0x00040000)
 786         {
 787             /* Disable AC flag, return */
 788             context->EFlags &= ~0x00040000;
 789             return;
 790         }
 791         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 792         break;
 793     default:
 794         ERR( "Got unexpected trap %d\n", trap_code );
 795         /* fall through */
 796     case T_NMI:       /* NMI interrupt */
 797     case T_DNA:       /* Device not available exception */
 798     case T_DOUBLEFLT: /* Double fault exception */
 799     case T_TSSFLT:    /* Invalid TSS exception */
 800     case T_RESERVED:  /* Unknown exception */
 801     case T_MCHK:      /* Machine check exception */
 802 #ifdef T_CACHEFLT
 803     case T_CACHEFLT:  /* Cache flush exception */
 804 #endif
 805         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 806         break;
 807     }
 808     EXC_RtlRaiseException( &rec, context );
 809 }
 810
 811
 812 /**********************************************************************
 813  *              do_trap
 814  *
 815  * Implementation of SIGTRAP handler.
 816  */
 817 static void do_trap( CONTEXT *context, int trap_code )
 818 {
 819     EXCEPTION_RECORD rec;
 820
 821     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 822     rec.ExceptionRecord  = NULL;
 823     rec.ExceptionAddress = (LPVOID)context->Eip;
 824     rec.NumberParameters = 0;
 825
 826     switch(trap_code)
 827     {
 828     case T_TRCTRAP:  /* Single-step exception */
 829         if (context->EFlags & 0x100)
 830         {
 831             rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 832             context->EFlags &= ~0x100;  /* clear single-step flag */
 833         }
 834         else
 835         {
 836             /* likely we get this because of a kill(SIGTRAP) on ourself,
 837              * so send a bp exception instead of a single step exception
 838              */
 839             TRACE("Spurious single step trap => breakpoint simulation\n");
 840             rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 841         }
 842         break;
 843     case T_BPTFLT:   /* Breakpoint exception */
 844         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 845         /* fall through */
 846     default:
 847         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 848         break;
 849     }
 850     EXC_RtlRaiseException( &rec, context );
 851 }
 852
 853
 854 /**********************************************************************
 855  *              do_fpe
 856  *
 857  * Implementation of SIGFPE handler
 858  */
 859 static void do_fpe( CONTEXT *context, int trap_code )
 860 {
 861     EXCEPTION_RECORD rec;
 862
 863     switch(trap_code)
 864     {
 865     case T_DIVIDE:   /* Division by zero exception */
 866         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 867         break;
 868     case T_FPOPFLT:   /* Coprocessor segment overrun */
 869         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 870         break;
 871     case T_ARITHTRAP:  /* Floating point exception */
 872     case T_UNKNOWN:    /* Unknown fault code */
 873         rec.ExceptionCode = get_fpu_code( context );
 874         break;
 875     default:
 876         ERR( "Got unexpected trap %d\n", trap_code );
 877         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 878         break;
 879     }
 880     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 881     rec.ExceptionRecord  = NULL;
 882     rec.ExceptionAddress = (LPVOID)context->Eip;
 883     rec.NumberParameters = 0;
 884     EXC_RtlRaiseException( &rec, context );
 885 }
 886
 887
 888 #ifdef __HAVE_VM86
 889 /**********************************************************************
 890  *              set_vm86_pend
 891  *
 892  * Handler for SIGUSR2, which we use to set the vm86 pending flag.
 893  */
 894 static void set_vm86_pend( CONTEXT *context )
 895 {
 896     EXCEPTION_RECORD rec;
 897     TEB *teb = NtCurrentTeb();
 898     struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
 899
 900     rec.ExceptionCode           = EXCEPTION_VM86_STI;
 901     rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
 902     rec.ExceptionRecord         = NULL;
 903     rec.NumberParameters        = 1;
 904     rec.ExceptionInformation[0] = 0;
 905
 906     /* __wine_enter_vm86() merges the vm86_pending flag in safely */
 907     teb->vm86_pending |= VIP_MASK;
 908     /* see if we were in VM86 mode */
 909     if (context->EFlags & 0x00020000)
 910     {
 911         /* seems so, also set flag in signal context */
 912         if (context->EFlags & VIP_MASK) return;
 913         context->EFlags |= VIP_MASK;
 914         vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
 915         if (context->EFlags & VIF_MASK) {
 916             /* VIF is set, throw exception */
 917             teb->vm86_pending = 0;
 918             teb->vm86_ptr = NULL;
 919             rec.ExceptionAddress = (LPVOID)context->Eip;
 920             EXC_RtlRaiseException( &rec, context );
 921             teb->vm86_ptr = vm86;
 922         }
 923     }
 924     else if (vm86)
 925     {
 926         /* not in VM86, but possibly setting up for it */
 927         if (vm86->regs.eflags & VIP_MASK) return;
 928         vm86->regs.eflags |= VIP_MASK;
 929         if (((char*)context->Eip >= (char*)vm86_return) &&
 930             ((char*)context->Eip <= (char*)vm86_return_end) &&
 931             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
 932             /* exiting from VM86, can't throw */
 933             return;
 934         }
 935         if (vm86->regs.eflags & VIF_MASK) {
 936             /* VIF is set, throw exception */
 937             CONTEXT vcontext;
 938             teb->vm86_pending = 0;
 939             teb->vm86_ptr = NULL;
 940             save_vm86_context( &vcontext, vm86 );
 941             rec.ExceptionAddress = (LPVOID)vcontext.Eip;
 942             EXC_RtlRaiseException( &rec, &vcontext );
 943             teb->vm86_ptr = vm86;
 944             restore_vm86_context( &vcontext, vm86 );
 945         }
 946     }
 947 }
 948
 949
 950 /**********************************************************************
 951  *              usr2_handler
 952  *
 953  * Handler for SIGUSR2.
 954  * We use it to signal that the running __wine_enter_vm86() should
 955  * immediately set VIP_MASK, causing pending events to be handled
 956  * as early as possible.
 957  */
 958 static HANDLER_DEF(usr2_handler)
 959 {
 960     CONTEXT context;
 961
 962     save_context( &context, HANDLER_CONTEXT );
 963     set_vm86_pend( &context );
 964     restore_context( &context, HANDLER_CONTEXT );
 965 }
 966
 967
 968 /**********************************************************************
 969  *              alrm_handler
 970  *
 971  * Handler for SIGALRM.
 972  * Increases the alarm counter and sets the vm86 pending flag.
 973  */
 974 static HANDLER_DEF(alrm_handler)
 975 {
 976     CONTEXT context;
 977
 978     save_context( &context, HANDLER_CONTEXT );
 979     NtCurrentTeb()->alarms++;
 980     set_vm86_pend( &context );
 981     restore_context( &context, HANDLER_CONTEXT );
 982 }
 983 #endif /* __HAVE_VM86 */
 984
 985
 986 /**********************************************************************
 987  *              segv_handler
 988  *
 989  * Handler for SIGSEGV and related errors.
 990  */
 991 static HANDLER_DEF(segv_handler)
 992 {
 993     CONTEXT context;
 994     save_context( &context, HANDLER_CONTEXT );
 995     do_segv( &context, get_trap_code(HANDLER_CONTEXT),
 996              get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
 997     restore_context( &context, HANDLER_CONTEXT );
 998 }
 999
1000
1001 /**********************************************************************
1002  *              trap_handler
1003  *
1004  * Handler for SIGTRAP.
1005  */
1006 static HANDLER_DEF(trap_handler)
1007 {
1008     CONTEXT context;
1009     save_context( &context, HANDLER_CONTEXT );
1010     do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
1011     restore_context( &context, HANDLER_CONTEXT );
1012 }
1013
1014
1015 /**********************************************************************
1016  *              fpe_handler
1017  *
1018  * Handler for SIGFPE.
1019  */
1020 static HANDLER_DEF(fpe_handler)
1021 {
1022     CONTEXT context;
1023     save_fpu( &context, HANDLER_CONTEXT );
1024     save_context( &context, HANDLER_CONTEXT );
1025     do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
1026     restore_context( &context, HANDLER_CONTEXT );
1027     restore_fpu( &context, HANDLER_CONTEXT );
1028 }
1029
1030
1031 /**********************************************************************
1032  *              int_handler
1033  *
1034  * Handler for SIGINT.
1035  */
1036 static HANDLER_DEF(int_handler)
1037 {
1038     if (!dispatch_signal(SIGINT))
1039     {
1040         EXCEPTION_RECORD rec;
1041         CONTEXT context;
1042
1043         save_context( &context, HANDLER_CONTEXT );
1044         rec.ExceptionCode    = CONTROL_C_EXIT;
1045         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1046         rec.ExceptionRecord  = NULL;
1047         rec.ExceptionAddress = (LPVOID)context.Eip;
1048         rec.NumberParameters = 0;
1049         EXC_RtlRaiseException( &rec, &context );
1050         restore_context( &context, HANDLER_CONTEXT );
1051     }
1052 }
1053
1054 /**********************************************************************
1055  *              abrt_handler
1056  *
1057  * Handler for SIGABRT.
1058  */
1059 static HANDLER_DEF(abrt_handler)
1060 {
1061     EXCEPTION_RECORD rec;
1062     CONTEXT context;
1063
1064     save_context( &context, HANDLER_CONTEXT );
1065     rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
1066     rec.ExceptionFlags   = EH_NONCONTINUABLE;
1067     rec.ExceptionRecord  = NULL;
1068     rec.ExceptionAddress = (LPVOID)context.Eip;
1069     rec.NumberParameters = 0;
1070     EXC_RtlRaiseException( &rec, &context ); /* Should never return.. */
1071     restore_context( &context, HANDLER_CONTEXT );
1072 }
1073
1074
1075 /***********************************************************************
1076  *           set_handler
1077  *
1078  * Set a signal handler
1079  */
1080 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1081 {
1082     struct sigaction sig_act;
1083
1084 #ifdef linux
1085     if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
1086     {
1087         struct kernel_sigaction sig_act;
1088         sig_act.ksa_handler = func;
1089         sig_act.ksa_flags   = SA_RESTART;
1090         sig_act.ksa_mask    = (1 << (SIGINT-1)) |
1091                               (1 << (SIGUSR2-1)) |
1092                               (1 << (SIGALRM-1));
1093         /* point to the top of the stack */
1094         sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
1095         return wine_sigaction( sig, &sig_act, NULL );
1096     }
1097 #endif  /* linux */
1098     sig_act.sa_handler = func;
1099     sigemptyset( &sig_act.sa_mask );
1100     sigaddset( &sig_act.sa_mask, SIGINT );
1101     sigaddset( &sig_act.sa_mask, SIGUSR2 );
1102     sigaddset( &sig_act.sa_mask, SIGALRM );
1103
1104 #ifdef linux
1105     sig_act.sa_flags = SA_RESTART;
1106 #elif defined (__svr4__) || defined(_SCO_DS)
1107     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1108 #else
1109     sig_act.sa_flags = 0;
1110 #endif
1111
1112 #ifdef SA_ONSTACK
1113     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1114 #endif
1115     return sigaction( sig, &sig_act, NULL );
1116 }
1117
1118
1119 /***********************************************************************
1120  *           __wine_set_signal_handler   (NTDLL.@)
1121  */
1122 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1123 {
1124     if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1125     if (handlers[sig] != NULL) return -2;
1126     handlers[sig] = wsh;
1127     return 0;
1128 }
1129
1130
1131 /**********************************************************************
1132  *              SIGNAL_Init
1133  */
1134 BOOL SIGNAL_Init(void)
1135 {
1136     int have_sigaltstack = 0;
1137
1138 #ifdef HAVE_SIGALTSTACK
1139     struct sigaltstack ss;
1140     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1141     {
1142         ss.ss_size  = SIGNAL_STACK_SIZE;
1143         ss.ss_flags = 0;
1144         if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1145 #ifdef linux
1146         /* sigaltstack may fail because the kernel is too old, or
1147            because glibc is brain-dead. In the latter case a
1148            direct system call should succeed. */
1149         else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1150 #endif  /* linux */
1151     }
1152 #endif  /* HAVE_SIGALTSTACK */
1153
1154     sigfillset( &all_sigs );
1155
1156     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1157     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1158     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1159     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1160     if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1161 #ifdef SIGBUS
1162     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1163 #endif
1164 #ifdef SIGTRAP
1165     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1166 #endif
1167
1168 #ifdef __HAVE_VM86
1169     if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
1170     if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1171 #endif
1172
1173     return TRUE;
1174
1175  error:
1176     perror("sigaction");
1177     return FALSE;
1178 }
1179
1180
1181 /**********************************************************************
1182  *              SIGNAL_Reset
1183  */
1184 void SIGNAL_Reset(void)
1185 {
1186     sigset_t block_set;
1187
1188     /* block the async signals */
1189     sigemptyset( &block_set );
1190     sigaddset( &block_set, SIGALRM );
1191     sigaddset( &block_set, SIGIO );
1192     sigaddset( &block_set, SIGHUP );
1193     sigaddset( &block_set, SIGUSR2 );
1194     sigprocmask( SIG_BLOCK, &block_set, NULL );
1195
1196     /* restore default handlers */
1197     signal( SIGINT, SIG_DFL );
1198     signal( SIGFPE, SIG_DFL );
1199     signal( SIGSEGV, SIG_DFL );
1200     signal( SIGILL, SIG_DFL );
1201 #ifdef SIGBUS
1202     signal( SIGBUS, SIG_DFL );
1203 #endif
1204 #ifdef SIGTRAP
1205     signal( SIGTRAP, SIG_DFL );
1206 #endif
1207 }
1208
1209
1210 #ifdef __HAVE_VM86
1211 /**********************************************************************
1212  *              __wine_enter_vm86   (NTDLL.@)
1213  *
1214  * Enter vm86 mode with the specified register context.
1215  */
1216 void __wine_enter_vm86( CONTEXT *context )
1217 {
1218     EXCEPTION_RECORD rec;
1219     TEB *teb = NtCurrentTeb();
1220     int res;
1221     struct vm86plus_struct vm86;
1222
1223     memset( &vm86, 0, sizeof(vm86) );
1224     for (;;)
1225     {
1226         restore_vm86_context( context, &vm86 );
1227         /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1228          * so save it on entry, just in case */
1229         teb->vm86_pending |= (context->EFlags & VIP_MASK);
1230         /* Work around race conditions with signal handler
1231          * (avoiding sigprocmask for performance reasons) */
1232         teb->vm86_ptr = &vm86;
1233         vm86.regs.eflags |= teb->vm86_pending;
1234         /* Check for VIF|VIP here, since vm86_enter doesn't */
1235         if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1236             teb->vm86_ptr = NULL;
1237             teb->vm86_pending = 0;
1238             context->EFlags |= VIP_MASK;
1239             rec.ExceptionCode = EXCEPTION_VM86_STI;
1240             rec.ExceptionInformation[0] = 0;
1241             goto cancel_vm86;
1242         }
1243
1244         do
1245         {
1246             res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1247             if (res < 0)
1248             {
1249                 errno = -res;
1250                 return;
1251             }
1252         } while (VM86_TYPE(res) == VM86_SIGNAL);
1253
1254         save_vm86_context( context, &vm86 );
1255         context->EFlags |= teb->vm86_pending;
1256
1257         switch(VM86_TYPE(res))
1258         {
1259         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1260             do_segv( context, T_PROTFLT, 0, 0 );
1261             continue;
1262         case VM86_TRAP: /* return due to DOS-debugger request */
1263             do_trap( context, VM86_ARG(res) );
1264             continue;
1265         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1266             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1267             break;
1268         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1269             teb->vm86_pending = 0;
1270             rec.ExceptionCode = EXCEPTION_VM86_STI;
1271             break;
1272         case VM86_PICRETURN: /* return due to pending PIC request */
1273             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1274             break;
1275         default:
1276             ERR( "unhandled result from vm86 mode %x\n", res );
1277             continue;
1278         }
1279         rec.ExceptionInformation[0] = VM86_ARG(res);
1280 cancel_vm86:
1281         rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
1282         rec.ExceptionRecord         = NULL;
1283         rec.ExceptionAddress        = (LPVOID)context->Eip;
1284         rec.NumberParameters        = 1;
1285         EXC_RtlRaiseException( &rec, context );
1286     }
1287 }
1288
1289 #else /* __HAVE_VM86 */
1290 /**********************************************************************
1291  *              __wine_enter_vm86   (NTDLL.@)
1292  */
1293 void __wine_enter_vm86( CONTEXT *context )
1294 {
1295     MESSAGE("vm86 mode not supported on this platform\n");
1296 }
1297 #endif /* __HAVE_VM86 */
1298
1299 /**********************************************************************
1300  *              DbgBreakPoint   (NTDLL.@)
1301  */
1302 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1303
1304 /**********************************************************************
1305  *              DbgUserBreakPoint   (NTDLL.@)
1306  */
1307 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1308
1309 #endif  /* __i386__ */