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