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                   __ASM_FUNC("vm86_return") "\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                   __ASM_FUNC("vm86_return_end") "\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 #ifdef __CYGWIN__
 253
 254 /* FIXME: This section is just here so it can compile, it's most likely
 255  * completely wrong. */
 256
 257 typedef struct
 258 {
 259     unsigned short sc_gs, __gsh;
 260     unsigned short sc_fs, __fsh;
 261     unsigned short sc_es, __esh;
 262     unsigned short sc_ds, __dsh;
 263     unsigned long sc_edi;
 264     unsigned long sc_esi;
 265     unsigned long sc_ebp;
 266     unsigned long sc_esp;
 267     unsigned long sc_ebx;
 268     unsigned long sc_edx;
 269     unsigned long sc_ecx;
 270     unsigned long sc_eax;
 271     unsigned long sc_trapno;
 272     unsigned long sc_err;
 273     unsigned long sc_eip;
 274     unsigned short sc_cs, __csh;
 275     unsigned long sc_eflags;
 276     unsigned long esp_at_signal;
 277     unsigned short sc_ss, __ssh;
 278     unsigned long i387;
 279     unsigned long oldmask;
 280     unsigned long cr2;
 281 } SIGCONTEXT;
 282
 283 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
 284 #define HANDLER_CONTEXT (&__context)
 285
 286 #endif /* __CYGWIN__ */
 287
 288 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
 289     defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
 290
 291 #define EAX_sig(context)     ((context)->sc_eax)
 292 #define EBX_sig(context)     ((context)->sc_ebx)
 293 #define ECX_sig(context)     ((context)->sc_ecx)
 294 #define EDX_sig(context)     ((context)->sc_edx)
 295 #define ESI_sig(context)     ((context)->sc_esi)
 296 #define EDI_sig(context)     ((context)->sc_edi)
 297 #define EBP_sig(context)     ((context)->sc_ebp)
 298
 299 #define CS_sig(context)      ((context)->sc_cs)
 300 #define DS_sig(context)      ((context)->sc_ds)
 301 #define ES_sig(context)      ((context)->sc_es)
 302 #define SS_sig(context)      ((context)->sc_ss)
 303
 304 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
 305  * saved by the exception handling. duh.
 306  * Actually they are in -current (have been for a while), and that
 307  * patch now finally has been MFC'd to -stable too (Nov 15 1999).
 308  * If you're running a system from the -stable branch older than that,
 309  * like a 3.3-RELEASE, grab the patch from the ports tree:
 310  * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
 311  * (If its not yet there when you look, go here:
 312  * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
 313  */
 314 #ifdef __FreeBSD__
 315 #define FS_sig(context)      ((context)->sc_fs)
 316 #define GS_sig(context)      ((context)->sc_gs)
 317 #endif
 318
 319 #ifdef linux
 320 #define FS_sig(context)      ((context)->sc_fs)
 321 #define GS_sig(context)      ((context)->sc_gs)
 322 #define CR2_sig(context)     ((context)->cr2)
 323 #define TRAP_sig(context)    ((context)->sc_trapno)
 324 #define ERROR_sig(context)   ((context)->sc_err)
 325 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 326 #endif
 327
 328 #ifndef __FreeBSD__
 329 #define EFL_sig(context)     ((context)->sc_eflags)
 330 #else
 331 #define EFL_sig(context)     ((context)->sc_efl)
 332 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 333 #define CR2_sig(context)     ((context)->sc_err)
 334 #define TRAP_sig(context)    ((context)->sc_trapno)
 335 #endif
 336
 337 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 338 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 339
 340 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 341
 342 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 343
 344 #ifdef _SCO_DS
 345 #define gregs regs
 346 #endif
 347
 348 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 349 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 350 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 351 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 352 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 353 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 354 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 355
 356 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 357 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 358 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 359 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 360
 361 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 362 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 363
 364 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 365
 366 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 367 #ifdef R_ESP
 368 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 369 #else
 370 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 371 #endif
 372 #ifdef TRAPNO
 373 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 374 #endif
 375
 376 #endif  /* svr4 || SCO_DS */
 377
 378
 379 /* exception code definitions (already defined by FreeBSD/NetBSD) */
 380 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
 381 #define T_DIVIDE        0   /* Division by zero exception */
 382 #define T_TRCTRAP       1   /* Single-step exception */
 383 #define T_NMI           2   /* NMI interrupt */
 384 #define T_BPTFLT        3   /* Breakpoint exception */
 385 #define T_OFLOW         4   /* Overflow exception */
 386 #define T_BOUND         5   /* Bound range exception */
 387 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 388 #define T_DNA           7   /* Device not available exception */
 389 #define T_DOUBLEFLT     8   /* Double fault exception */
 390 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 391 #define T_TSSFLT        10  /* Invalid TSS exception */
 392 #define T_SEGNPFLT      11  /* Segment not present exception */
 393 #define T_STKFLT        12  /* Stack fault */
 394 #define T_PROTFLT       13  /* General protection fault */
 395 #define T_PAGEFLT       14  /* Page fault */
 396 #define T_RESERVED      15  /* Unknown exception */
 397 #define T_ARITHTRAP     16  /* Floating point exception */
 398 #define T_ALIGNFLT      17  /* Alignment check exception */
 399 #define T_MCHK          18  /* Machine check exception */
 400 #define T_CACHEFLT      19  /* Cache flush exception */
 401 #endif
 402 #if defined(__NetBSD__)
 403 #define T_MCHK          19  /* Machine check exception */
 404 #endif
 405
 406 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 407
 408 #include "wine/exception.h"
 409 #include "winnt.h"
 410 #include "stackframe.h"
 411 #include "global.h"
 412 #include "miscemu.h"
 413 #include "ntddk.h"
 414 #include "syslevel.h"
 415 #include "wine/debug.h"
 416
 417 WINE_DEFAULT_DEBUG_CHANNEL(seh);
 418
 419 typedef int (*wine_signal_handler)(unsigned sig);
 420
 421 static wine_signal_handler handlers[256];
 422
 423 static sigset_t all_sigs;
 424
 425
 426 /***********************************************************************
 427  *           dispatch_signal
 428  */
 429 inline static int dispatch_signal(unsigned sig)
 430 {
 431     if (handlers[sig] == NULL) return 0;
 432     return handlers[sig](sig);
 433 }
 434
 435
 436 /***********************************************************************
 437  *           get_trap_code
 438  *
 439  * Get the trap code for a signal.
 440  */
 441 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 442 {
 443 #ifdef TRAP_sig
 444     return TRAP_sig(sigcontext);
 445 #else
 446     return T_UNKNOWN;  /* unknown trap code */
 447 #endif
 448 }
 449
 450 /***********************************************************************
 451  *           get_error_code
 452  *
 453  * Get the error code for a signal.
 454  */
 455 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 456 {
 457 #ifdef ERROR_sig
 458     return ERROR_sig(sigcontext);
 459 #else
 460     return 0;
 461 #endif
 462 }
 463
 464 /***********************************************************************
 465  *           get_cr2_value
 466  *
 467  * Get the CR2 value for a signal.
 468  */
 469 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
 470 {
 471 #ifdef CR2_sig
 472     return (void *)CR2_sig(sigcontext);
 473 #else
 474     return NULL;
 475 #endif
 476 }
 477
 478
 479 #ifdef __HAVE_VM86
 480 /***********************************************************************
 481  *           save_vm86_context
 482  *
 483  * Set the register values from a vm86 structure.
 484  */
 485 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 486 {
 487     context->Eax    = vm86->regs.eax;
 488     context->Ebx    = vm86->regs.ebx;
 489     context->Ecx    = vm86->regs.ecx;
 490     context->Edx    = vm86->regs.edx;
 491     context->Esi    = vm86->regs.esi;
 492     context->Edi    = vm86->regs.edi;
 493     context->Esp    = vm86->regs.esp;
 494     context->Ebp    = vm86->regs.ebp;
 495     context->Eip    = vm86->regs.eip;
 496     context->SegCs  = vm86->regs.cs;
 497     context->SegDs  = vm86->regs.ds;
 498     context->SegEs  = vm86->regs.es;
 499     context->SegFs  = vm86->regs.fs;
 500     context->SegGs  = vm86->regs.gs;
 501     context->SegSs  = vm86->regs.ss;
 502     context->EFlags = vm86->regs.eflags;
 503 }
 504
 505
 506 /***********************************************************************
 507  *           restore_vm86_context
 508  *
 509  * Build a vm86 structure from the register values.
 510  */
 511 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 512 {
 513     vm86->regs.eax    = context->Eax;
 514     vm86->regs.ebx    = context->Ebx;
 515     vm86->regs.ecx    = context->Ecx;
 516     vm86->regs.edx    = context->Edx;
 517     vm86->regs.esi    = context->Esi;
 518     vm86->regs.edi    = context->Edi;
 519     vm86->regs.esp    = context->Esp;
 520     vm86->regs.ebp    = context->Ebp;
 521     vm86->regs.eip    = context->Eip;
 522     vm86->regs.cs     = context->SegCs;
 523     vm86->regs.ds     = context->SegDs;
 524     vm86->regs.es     = context->SegEs;
 525     vm86->regs.fs     = context->SegFs;
 526     vm86->regs.gs     = context->SegGs;
 527     vm86->regs.ss     = context->SegSs;
 528     vm86->regs.eflags = context->EFlags;
 529 }
 530 #endif /* __HAVE_VM86 */
 531
 532
 533 /***********************************************************************
 534  *           save_context
 535  *
 536  * Set the register values from a sigcontext.
 537  */
 538 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 539 {
 540     WORD fs;
 541     /* get %fs at time of the fault */
 542 #ifdef FS_sig
 543     fs = FS_sig(sigcontext);
 544 #else
 545     fs = wine_get_fs();
 546 #endif
 547     context->SegFs = fs;
 548
 549     /* now restore a proper %fs for the fault handler */
 550     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)))  /* 16-bit mode */
 551     {
 552         fs = SYSLEVEL_Win16CurrentTeb;
 553     }
 554 #ifdef __HAVE_VM86
 555     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 556     {
 557         /* fetch the saved %fs on the stack */
 558         fs = *(unsigned int *)ESP_sig(sigcontext);
 559         if (EAX_sig(sigcontext) == VM86_EAX) {
 560             struct vm86plus_struct *vm86;
 561             wine_set_fs(fs);
 562             /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 563              * (but we could also get if from teb->vm86_ptr) */
 564             vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
 565             /* get context from vm86 struct */
 566             save_vm86_context( context, vm86 );
 567             return;
 568         }
 569     }
 570 #endif  /* __HAVE_VM86 */
 571
 572     wine_set_fs(fs);
 573
 574     context->Eax    = EAX_sig(sigcontext);
 575     context->Ebx    = EBX_sig(sigcontext);
 576     context->Ecx    = ECX_sig(sigcontext);
 577     context->Edx    = EDX_sig(sigcontext);
 578     context->Esi    = ESI_sig(sigcontext);
 579     context->Edi    = EDI_sig(sigcontext);
 580     context->Ebp    = EBP_sig(sigcontext);
 581     context->EFlags = EFL_sig(sigcontext);
 582     context->Eip    = EIP_sig(sigcontext);
 583     context->Esp    = ESP_sig(sigcontext);
 584     context->SegCs  = LOWORD(CS_sig(sigcontext));
 585     context->SegDs  = LOWORD(DS_sig(sigcontext));
 586     context->SegEs  = LOWORD(ES_sig(sigcontext));
 587     context->SegSs  = LOWORD(SS_sig(sigcontext));
 588 #ifdef GS_sig
 589     context->SegGs  = LOWORD(GS_sig(sigcontext));
 590 #else
 591     context->SegGs  = wine_get_gs();
 592 #endif
 593 }
 594
 595
 596 /***********************************************************************
 597  *           restore_context
 598  *
 599  * Build a sigcontext from the register values.
 600  */
 601 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 602 {
 603 #ifdef __HAVE_VM86
 604     /* check if exception occurred in vm86 mode */
 605     if ((void *)EIP_sig(sigcontext) == vm86_return &&
 606         IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
 607         EAX_sig(sigcontext) == VM86_EAX)
 608     {
 609         /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 610          * (but we could also get it from teb->vm86_ptr) */
 611         struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
 612         restore_vm86_context( context, vm86 );
 613         return;
 614     }
 615 #endif /* __HAVE_VM86 */
 616
 617     EAX_sig(sigcontext) = context->Eax;
 618     EBX_sig(sigcontext) = context->Ebx;
 619     ECX_sig(sigcontext) = context->Ecx;
 620     EDX_sig(sigcontext) = context->Edx;
 621     ESI_sig(sigcontext) = context->Esi;
 622     EDI_sig(sigcontext) = context->Edi;
 623     EBP_sig(sigcontext) = context->Ebp;
 624     EFL_sig(sigcontext) = context->EFlags;
 625     EIP_sig(sigcontext) = context->Eip;
 626     ESP_sig(sigcontext) = context->Esp;
 627     CS_sig(sigcontext)  = context->SegCs;
 628     DS_sig(sigcontext)  = context->SegDs;
 629     ES_sig(sigcontext)  = context->SegEs;
 630     SS_sig(sigcontext)  = context->SegSs;
 631 #ifdef FS_sig
 632     FS_sig(sigcontext)  = context->SegFs;
 633 #else
 634     wine_set_fs( context->SegFs );
 635 #endif
 636 #ifdef GS_sig
 637     GS_sig(sigcontext)  = context->SegGs;
 638 #else
 639     wine_set_gs( context->SegGs );
 640 #endif
 641 }
 642
 643
 644 /***********************************************************************
 645  *           save_fpu
 646  *
 647  * Set the FPU context from a sigcontext.
 648  */
 649 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 650 {
 651 #ifdef FPU_sig
 652     if (FPU_sig(sigcontext))
 653     {
 654         context->FloatSave = *FPU_sig(sigcontext);
 655         return;
 656     }
 657 #endif  /* FPU_sig */
 658 #ifdef __GNUC__
 659     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 660 #endif  /* __GNUC__ */
 661 }
 662
 663
 664 /***********************************************************************
 665  *           restore_fpu
 666  *
 667  * Restore the FPU context to a sigcontext.
 668  */
 669 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 670 {
 671     /* reset the current interrupt status */
 672     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 673 #ifdef FPU_sig
 674     if (FPU_sig(sigcontext))
 675     {
 676         *FPU_sig(sigcontext) = context->FloatSave;
 677         return;
 678     }
 679 #endif  /* FPU_sig */
 680 #ifdef __GNUC__
 681     /* avoid nested exceptions */
 682     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 683 #endif  /* __GNUC__ */
 684 }
 685
 686
 687 /**********************************************************************
 688  *              get_fpu_code
 689  *
 690  * Get the FPU exception code from the FPU status.
 691  */
 692 static inline DWORD get_fpu_code( const CONTEXT *context )
 693 {
 694     DWORD status = context->FloatSave.StatusWord;
 695
 696     if (status & 0x01)  /* IE */
 697     {
 698         if (status & 0x40)  /* SF */
 699             return EXCEPTION_FLT_STACK_CHECK;
 700         else
 701             return EXCEPTION_FLT_INVALID_OPERATION;
 702     }
 703     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 704     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 705     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 706     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 707     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 708     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 709 }
 710
 711
 712 /***********************************************************************
 713  *           SIGNAL_Unblock
 714  *
 715  * Unblock signals. Called from EXC_RtlRaiseException.
 716  */
 717 void SIGNAL_Unblock( void )
 718 {
 719     sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
 720 }
 721
 722
 723 /**********************************************************************
 724  *              do_segv
 725  *
 726  * Implementation of SIGSEGV handler.
 727  */
 728 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
 729 {
 730     EXCEPTION_RECORD rec;
 731     DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
 732
 733 #ifdef CR2_sig
 734     /* we want the page-fault case to be fast */
 735     if (trap_code == T_PAGEFLT)
 736         if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
 737 #endif
 738
 739     rec.ExceptionRecord  = NULL;
 740     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 741     rec.ExceptionAddress = (LPVOID)context->Eip;
 742     rec.NumberParameters = 0;
 743
 744     switch(trap_code)
 745     {
 746     case T_OFLOW:   /* Overflow exception */
 747         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 748         break;
 749     case T_BOUND:   /* Bound range exception */
 750         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 751         break;
 752     case T_PRIVINFLT:   /* Invalid opcode exception */
 753         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 754         break;
 755     case T_STKFLT:  /* Stack fault */
 756         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 757         break;
 758     case T_SEGNPFLT:  /* Segment not present exception */
 759     case T_PROTFLT:   /* General protection fault */
 760     case T_UNKNOWN:   /* Unknown fault code */
 761         if (INSTR_EmulateInstruction( context )) return;
 762         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 763         break;
 764     case T_PAGEFLT:  /* Page fault */
 765 #ifdef CR2_sig
 766         rec.NumberParameters = 2;
 767         rec.ExceptionInformation[0] = (err_code & 2) != 0;
 768         rec.ExceptionInformation[1] = (DWORD)cr2;
 769 #endif /* CR2_sig */
 770         rec.ExceptionCode = page_fault_code;
 771         break;
 772     case T_ALIGNFLT:  /* Alignment check exception */
 773         /* FIXME: pass through exception handler first? */
 774         if (context->EFlags & 0x00040000)
 775         {
 776             /* Disable AC flag, return */
 777             context->EFlags &= ~0x00040000;
 778             return;
 779         }
 780         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 781         break;
 782     default:
 783         ERR( "Got unexpected trap %d\n", trap_code );
 784         /* fall through */
 785     case T_NMI:       /* NMI interrupt */
 786     case T_DNA:       /* Device not available exception */
 787     case T_DOUBLEFLT: /* Double fault exception */
 788     case T_TSSFLT:    /* Invalid TSS exception */
 789     case T_RESERVED:  /* Unknown exception */
 790     case T_MCHK:      /* Machine check exception */
 791 #ifdef T_CACHEFLT
 792     case T_CACHEFLT:  /* Cache flush exception */
 793 #endif
 794         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 795         break;
 796     }
 797     EXC_RtlRaiseException( &rec, context );
 798 }
 799
 800
 801 /**********************************************************************
 802  *              do_trap
 803  *
 804  * Implementation of SIGTRAP handler.
 805  */
 806 static void do_trap( CONTEXT *context, int trap_code )
 807 {
 808     EXCEPTION_RECORD rec;
 809
 810     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 811     rec.ExceptionRecord  = NULL;
 812     rec.ExceptionAddress = (LPVOID)context->Eip;
 813     rec.NumberParameters = 0;
 814
 815     switch(trap_code)
 816     {
 817     case T_TRCTRAP:  /* Single-step exception */
 818         if (context->EFlags & 0x100)
 819         {
 820             rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 821             context->EFlags &= ~0x100;  /* clear single-step flag */
 822         }
 823         else
 824         {
 825             /* likely we get this because of a kill(SIGTRAP) on ourself,
 826              * so send a bp exception instead of a single step exception
 827              */
 828             TRACE("Spurious single step trap => breakpoint simulation\n");
 829             rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 830         }
 831         break;
 832     case T_BPTFLT:   /* Breakpoint exception */
 833         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 834         /* fall through */
 835     default:
 836         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 837         break;
 838     }
 839     EXC_RtlRaiseException( &rec, context );
 840 }
 841
 842
 843 /**********************************************************************
 844  *              do_fpe
 845  *
 846  * Implementation of SIGFPE handler
 847  */
 848 static void do_fpe( CONTEXT *context, int trap_code )
 849 {
 850     EXCEPTION_RECORD rec;
 851
 852     switch(trap_code)
 853     {
 854     case T_DIVIDE:   /* Division by zero exception */
 855         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 856         break;
 857     case T_FPOPFLT:   /* Coprocessor segment overrun */
 858         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 859         break;
 860     case T_ARITHTRAP:  /* Floating point exception */
 861     case T_UNKNOWN:    /* Unknown fault code */
 862         rec.ExceptionCode = get_fpu_code( context );
 863         break;
 864     default:
 865         ERR( "Got unexpected trap %d\n", trap_code );
 866         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 867         break;
 868     }
 869     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 870     rec.ExceptionRecord  = NULL;
 871     rec.ExceptionAddress = (LPVOID)context->Eip;
 872     rec.NumberParameters = 0;
 873     EXC_RtlRaiseException( &rec, context );
 874 }
 875
 876
 877 #ifdef __HAVE_VM86
 878 /**********************************************************************
 879  *              set_vm86_pend
 880  *
 881  * Handler for SIGUSR2, which we use to set the vm86 pending flag.
 882  */
 883 static void set_vm86_pend( CONTEXT *context )
 884 {
 885     EXCEPTION_RECORD rec;
 886     TEB *teb = NtCurrentTeb();
 887     struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
 888
 889     rec.ExceptionCode           = EXCEPTION_VM86_STI;
 890     rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
 891     rec.ExceptionRecord         = NULL;
 892     rec.NumberParameters        = 1;
 893     rec.ExceptionInformation[0] = 0;
 894
 895     /* __wine_enter_vm86() merges the vm86_pending flag in safely */
 896     teb->vm86_pending |= VIP_MASK;
 897     /* see if we were in VM86 mode */
 898     if (context->EFlags & 0x00020000)
 899     {
 900         /* seems so, also set flag in signal context */
 901         if (context->EFlags & VIP_MASK) return;
 902         context->EFlags |= VIP_MASK;
 903         vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
 904         if (context->EFlags & VIF_MASK) {
 905             /* VIF is set, throw exception */
 906             teb->vm86_pending = 0;
 907             teb->vm86_ptr = NULL;
 908             rec.ExceptionAddress = (LPVOID)context->Eip;
 909             EXC_RtlRaiseException( &rec, context );
 910             teb->vm86_ptr = vm86;
 911         }
 912     }
 913     else if (vm86)
 914     {
 915         /* not in VM86, but possibly setting up for it */
 916         if (vm86->regs.eflags & VIP_MASK) return;
 917         vm86->regs.eflags |= VIP_MASK;
 918         if (((char*)context->Eip >= (char*)vm86_return) &&
 919             ((char*)context->Eip <= (char*)vm86_return_end) &&
 920             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
 921             /* exiting from VM86, can't throw */
 922             return;
 923         }
 924         if (vm86->regs.eflags & VIF_MASK) {
 925             /* VIF is set, throw exception */
 926             CONTEXT vcontext;
 927             teb->vm86_pending = 0;
 928             teb->vm86_ptr = NULL;
 929             save_vm86_context( &vcontext, vm86 );
 930             rec.ExceptionAddress = (LPVOID)vcontext.Eip;
 931             EXC_RtlRaiseException( &rec, &vcontext );
 932             teb->vm86_ptr = vm86;
 933             restore_vm86_context( &vcontext, vm86 );
 934         }
 935     }
 936 }
 937
 938
 939 /**********************************************************************
 940  *              usr2_handler
 941  *
 942  * Handler for SIGUSR2.
 943  * We use it to signal that the running __wine_enter_vm86() should
 944  * immediately set VIP_MASK, causing pending events to be handled
 945  * as early as possible.
 946  */
 947 static HANDLER_DEF(usr2_handler)
 948 {
 949     CONTEXT context;
 950
 951     save_context( &context, HANDLER_CONTEXT );
 952     set_vm86_pend( &context );
 953     restore_context( &context, HANDLER_CONTEXT );
 954 }
 955
 956
 957 /**********************************************************************
 958  *              alrm_handler
 959  *
 960  * Handler for SIGALRM.
 961  * Increases the alarm counter and sets the vm86 pending flag.
 962  */
 963 static HANDLER_DEF(alrm_handler)
 964 {
 965     CONTEXT context;
 966
 967     save_context( &context, HANDLER_CONTEXT );
 968     NtCurrentTeb()->alarms++;
 969     set_vm86_pend( &context );
 970     restore_context( &context, HANDLER_CONTEXT );
 971 }
 972 #endif /* __HAVE_VM86 */
 973
 974
 975 /**********************************************************************
 976  *              segv_handler
 977  *
 978  * Handler for SIGSEGV and related errors.
 979  */
 980 static HANDLER_DEF(segv_handler)
 981 {
 982     CONTEXT context;
 983     save_context( &context, HANDLER_CONTEXT );
 984     do_segv( &context, get_trap_code(HANDLER_CONTEXT),
 985              get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
 986     restore_context( &context, HANDLER_CONTEXT );
 987 }
 988
 989
 990 /**********************************************************************
 991  *              trap_handler
 992  *
 993  * Handler for SIGTRAP.
 994  */
 995 static HANDLER_DEF(trap_handler)
 996 {
 997     CONTEXT context;
 998     save_context( &context, HANDLER_CONTEXT );
 999     do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
1000     restore_context( &context, HANDLER_CONTEXT );
1001 }
1002
1003
1004 /**********************************************************************
1005  *              fpe_handler
1006  *
1007  * Handler for SIGFPE.
1008  */
1009 static HANDLER_DEF(fpe_handler)
1010 {
1011     CONTEXT context;
1012     save_fpu( &context, HANDLER_CONTEXT );
1013     save_context( &context, HANDLER_CONTEXT );
1014     do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
1015     restore_context( &context, HANDLER_CONTEXT );
1016     restore_fpu( &context, HANDLER_CONTEXT );
1017 }
1018
1019
1020 /**********************************************************************
1021  *              int_handler
1022  *
1023  * Handler for SIGINT.
1024  */
1025 static HANDLER_DEF(int_handler)
1026 {
1027     if (!dispatch_signal(SIGINT))
1028     {
1029         EXCEPTION_RECORD rec;
1030         CONTEXT context;
1031
1032         save_context( &context, HANDLER_CONTEXT );
1033         rec.ExceptionCode    = CONTROL_C_EXIT;
1034         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1035         rec.ExceptionRecord  = NULL;
1036         rec.ExceptionAddress = (LPVOID)context.Eip;
1037         rec.NumberParameters = 0;
1038         EXC_RtlRaiseException( &rec, &context );
1039         restore_context( &context, HANDLER_CONTEXT );
1040     }
1041 }
1042
1043
1044 /***********************************************************************
1045  *           set_handler
1046  *
1047  * Set a signal handler
1048  */
1049 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1050 {
1051     struct sigaction sig_act;
1052
1053 #ifdef linux
1054     if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
1055     {
1056         struct kernel_sigaction sig_act;
1057         sig_act.ksa_handler = func;
1058         sig_act.ksa_flags   = SA_RESTART;
1059         sig_act.ksa_mask    = (1 << (SIGINT-1)) |
1060                               (1 << (SIGALRM-1));
1061         /* point to the top of the stack */
1062         sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
1063         return wine_sigaction( sig, &sig_act, NULL );
1064     }
1065 #endif  /* linux */
1066     sig_act.sa_handler = func;
1067     sigemptyset( &sig_act.sa_mask );
1068     sigaddset( &sig_act.sa_mask, SIGINT );
1069     sigaddset( &sig_act.sa_mask, SIGALRM );
1070
1071 #ifdef linux
1072     sig_act.sa_flags = SA_RESTART;
1073 #elif defined (__svr4__) || defined(_SCO_DS)
1074     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1075 #else
1076     sig_act.sa_flags = 0;
1077 #endif
1078
1079 #ifdef SA_ONSTACK
1080     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1081 #endif
1082     return sigaction( sig, &sig_act, NULL );
1083 }
1084
1085
1086 /***********************************************************************
1087  *           __wine_set_signal_handler   (NTDLL.@)
1088  */
1089 int __wine_set_signal_handler(unsigned sig, wine_signal_handler wsh)
1090 {
1091     if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1092     if (handlers[sig] != NULL) return -2;
1093     handlers[sig] = wsh;
1094     return 0;
1095 }
1096
1097
1098 /**********************************************************************
1099  *              SIGNAL_Init
1100  */
1101 BOOL SIGNAL_Init(void)
1102 {
1103     int have_sigaltstack = 0;
1104
1105 #ifdef HAVE_SIGALTSTACK
1106     struct sigaltstack ss;
1107     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1108     {
1109         ss.ss_size  = SIGNAL_STACK_SIZE;
1110         ss.ss_flags = 0;
1111         if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1112 #ifdef linux
1113         /* sigaltstack may fail because the kernel is too old, or
1114            because glibc is brain-dead. In the latter case a
1115            direct system call should succeed. */
1116         else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1117 #endif  /* linux */
1118     }
1119 #endif  /* HAVE_SIGALTSTACK */
1120
1121     sigfillset( &all_sigs );
1122
1123     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1124     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1125     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1126     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1127 #ifdef SIGBUS
1128     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1129 #endif
1130 #ifdef SIGTRAP
1131     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1132 #endif
1133
1134 #ifdef __HAVE_VM86
1135     if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
1136     if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1137 #endif
1138
1139     return TRUE;
1140
1141  error:
1142     perror("sigaction");
1143     return FALSE;
1144 }
1145
1146
1147 /**********************************************************************
1148  *              SIGNAL_Reset
1149  */
1150 void SIGNAL_Reset(void)
1151 {
1152     sigset_t block_set;
1153
1154     /* block the async signals */
1155     sigemptyset( &block_set );
1156     sigaddset( &block_set, SIGALRM );
1157     sigaddset( &block_set, SIGIO );
1158     sigaddset( &block_set, SIGHUP );
1159     sigaddset( &block_set, SIGUSR2 );
1160     sigprocmask( SIG_BLOCK, &block_set, NULL );
1161
1162     /* restore default handlers */
1163     signal( SIGINT, SIG_DFL );
1164     signal( SIGFPE, SIG_DFL );
1165     signal( SIGSEGV, SIG_DFL );
1166     signal( SIGILL, SIG_DFL );
1167 #ifdef SIGBUS
1168     signal( SIGBUS, SIG_DFL );
1169 #endif
1170 #ifdef SIGTRAP
1171     signal( SIGTRAP, SIG_DFL );
1172 #endif
1173 }
1174
1175
1176 #ifdef __HAVE_VM86
1177 /**********************************************************************
1178  *              __wine_enter_vm86
1179  *
1180  * Enter vm86 mode with the specified register context.
1181  */
1182 void __wine_enter_vm86( CONTEXT *context )
1183 {
1184     EXCEPTION_RECORD rec;
1185     TEB *teb = NtCurrentTeb();
1186     int res;
1187     struct vm86plus_struct vm86;
1188
1189     memset( &vm86, 0, sizeof(vm86) );
1190     for (;;)
1191     {
1192         restore_vm86_context( context, &vm86 );
1193         /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1194          * so save it on entry, just in case */
1195         teb->vm86_pending |= (context->EFlags & VIP_MASK);
1196         /* Work around race conditions with signal handler
1197          * (avoiding sigprocmask for performance reasons) */
1198         teb->vm86_ptr = &vm86;
1199         vm86.regs.eflags |= teb->vm86_pending;
1200         /* Check for VIF|VIP here, since vm86_enter doesn't */
1201         if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1202             teb->vm86_ptr = NULL;
1203             teb->vm86_pending = 0;
1204             context->EFlags |= VIP_MASK;
1205             rec.ExceptionCode = EXCEPTION_VM86_STI;
1206             rec.ExceptionInformation[0] = 0;
1207             goto cancel_vm86;
1208         }
1209
1210         do
1211         {
1212             res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1213             if (res < 0)
1214             {
1215                 errno = -res;
1216                 return;
1217             }
1218         } while (VM86_TYPE(res) == VM86_SIGNAL);
1219
1220         save_vm86_context( context, &vm86 );
1221         context->EFlags |= teb->vm86_pending;
1222
1223         switch(VM86_TYPE(res))
1224         {
1225         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1226             do_segv( context, T_PROTFLT, 0, 0 );
1227             continue;
1228         case VM86_TRAP: /* return due to DOS-debugger request */
1229             do_trap( context, VM86_ARG(res) );
1230             continue;
1231         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1232             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1233             break;
1234         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1235             teb->vm86_pending = 0;
1236             rec.ExceptionCode = EXCEPTION_VM86_STI;
1237             break;
1238         case VM86_PICRETURN: /* return due to pending PIC request */
1239             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1240             break;
1241         default:
1242             ERR( "unhandled result from vm86 mode %x\n", res );
1243             continue;
1244         }
1245         rec.ExceptionInformation[0] = VM86_ARG(res);
1246 cancel_vm86:
1247         rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
1248         rec.ExceptionRecord         = NULL;
1249         rec.ExceptionAddress        = (LPVOID)context->Eip;
1250         rec.NumberParameters        = 1;
1251         EXC_RtlRaiseException( &rec, context );
1252     }
1253 }
1254
1255 #else /* __HAVE_VM86 */
1256 void __wine_enter_vm86( CONTEXT *context )
1257 {
1258     MESSAGE("vm86 mode not supported on this platform\n");
1259 }
1260 #endif /* __HAVE_VM86 */
1261
1262 /**********************************************************************
1263  *              DbgBreakPoint   (NTDLL.@)
1264  */
1265 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1266
1267 /**********************************************************************
1268  *              DbgUserBreakPoint   (NTDLL.@)
1269  */
1270 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1271
1272 #endif  /* __i386__ */