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 #include "ntdll_misc.h"
  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 %gs\n\t"
 151                   "pushl %fs\n\t"
 152                   "int $0x80\n"
 153                   ".globl " __ASM_NAME("vm86_return") "\n\t"
 154                   __ASM_FUNC("vm86_return") "\n"
 155                   __ASM_NAME("vm86_return") ":\n\t"
 156                   "popl %fs\n\t"
 157                   "popl %gs\n\t"
 158                   "popl %ecx\n\t"
 159                   "popl %ebx\n\t"
 160                   "popl %ebp\n\t"
 161                   "testl %eax,%eax\n\t"
 162                   "jl 0f\n\t"
 163                   "cmpb $0,%al\n\t" /* VM86_SIGNAL */
 164                   "je " __ASM_NAME("vm86_enter") "\n\t"
 165                   "0:\n\t"
 166                   "movl 4(%esp),%ecx\n\t"  /* vm86_ptr */
 167                   "movl $0,(%ecx)\n\t"
 168                   ".globl " __ASM_NAME("vm86_return_end") "\n\t"
 169                   __ASM_FUNC("vm86_return_end") "\n"
 170                   __ASM_NAME("vm86_return_end") ":\n\t"
 171                   "ret" );
 172
 173 #ifdef HAVE_SYS_VM86_H
 174 # define __HAVE_VM86
 175 #endif
 176
 177 #endif  /* linux */
 178
 179 #ifdef BSDI
 180
 181 #define EAX_sig(context)     ((context)->tf_eax)
 182 #define EBX_sig(context)     ((context)->tf_ebx)
 183 #define ECX_sig(context)     ((context)->tf_ecx)
 184 #define EDX_sig(context)     ((context)->tf_edx)
 185 #define ESI_sig(context)     ((context)->tf_esi)
 186 #define EDI_sig(context)     ((context)->tf_edi)
 187 #define EBP_sig(context)     ((context)->tf_ebp)
 188
 189 #define CS_sig(context)      ((context)->tf_cs)
 190 #define DS_sig(context)      ((context)->tf_ds)
 191 #define ES_sig(context)      ((context)->tf_es)
 192 #define SS_sig(context)      ((context)->tf_ss)
 193
 194 #include <machine/frame.h>
 195 typedef struct trapframe SIGCONTEXT;
 196
 197 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 198 #define HANDLER_CONTEXT __context
 199
 200 #define EFL_sig(context)     ((context)->tf_eflags)
 201
 202 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 203 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 204
 205 #endif /* bsdi */
 206
 207 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 208
 209 typedef struct sigcontext SIGCONTEXT;
 210
 211 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 212 #define HANDLER_CONTEXT __context
 213
 214 #endif  /* FreeBSD */
 215
 216 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 217
 218 #ifdef _SCO_DS
 219 #include <sys/regset.h>
 220 #endif
 221 /* Solaris kludge */
 222 #undef ERR
 223 #include <sys/ucontext.h>
 224 #undef ERR
 225 typedef struct ucontext SIGCONTEXT;
 226
 227 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
 228 #define HANDLER_CONTEXT __context
 229
 230 #endif  /* svr4 || SCO_DS */
 231
 232 #ifdef __EMX__
 233
 234 typedef struct
 235 {
 236     unsigned long ContextFlags;
 237     FLOATING_SAVE_AREA sc_float;
 238     unsigned long sc_gs;
 239     unsigned long sc_fs;
 240     unsigned long sc_es;
 241     unsigned long sc_ds;
 242     unsigned long sc_edi;
 243     unsigned long sc_esi;
 244     unsigned long sc_eax;
 245     unsigned long sc_ebx;
 246     unsigned long sc_ecx;
 247     unsigned long sc_edx;
 248     unsigned long sc_ebp;
 249     unsigned long sc_eip;
 250     unsigned long sc_cs;
 251     unsigned long sc_eflags;
 252     unsigned long sc_esp;
 253     unsigned long sc_ss;
 254 } SIGCONTEXT;
 255
 256 #endif  /* __EMX__ */
 257
 258 #ifdef __CYGWIN__
 259
 260 /* FIXME: This section is just here so it can compile, it's most likely
 261  * completely wrong. */
 262
 263 typedef struct
 264 {
 265     unsigned short sc_gs, __gsh;
 266     unsigned short sc_fs, __fsh;
 267     unsigned short sc_es, __esh;
 268     unsigned short sc_ds, __dsh;
 269     unsigned long sc_edi;
 270     unsigned long sc_esi;
 271     unsigned long sc_ebp;
 272     unsigned long sc_esp;
 273     unsigned long sc_ebx;
 274     unsigned long sc_edx;
 275     unsigned long sc_ecx;
 276     unsigned long sc_eax;
 277     unsigned long sc_trapno;
 278     unsigned long sc_err;
 279     unsigned long sc_eip;
 280     unsigned short sc_cs, __csh;
 281     unsigned long sc_eflags;
 282     unsigned long esp_at_signal;
 283     unsigned short sc_ss, __ssh;
 284     unsigned long i387;
 285     unsigned long oldmask;
 286     unsigned long cr2;
 287 } SIGCONTEXT;
 288
 289 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
 290 #define HANDLER_CONTEXT (&__context)
 291
 292 #endif /* __CYGWIN__ */
 293
 294 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
 295     defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
 296
 297 #define EAX_sig(context)     ((context)->sc_eax)
 298 #define EBX_sig(context)     ((context)->sc_ebx)
 299 #define ECX_sig(context)     ((context)->sc_ecx)
 300 #define EDX_sig(context)     ((context)->sc_edx)
 301 #define ESI_sig(context)     ((context)->sc_esi)
 302 #define EDI_sig(context)     ((context)->sc_edi)
 303 #define EBP_sig(context)     ((context)->sc_ebp)
 304
 305 #define CS_sig(context)      ((context)->sc_cs)
 306 #define DS_sig(context)      ((context)->sc_ds)
 307 #define ES_sig(context)      ((context)->sc_es)
 308 #define FS_sig(context)      ((context)->sc_fs)
 309 #define GS_sig(context)      ((context)->sc_gs)
 310 #define SS_sig(context)      ((context)->sc_ss)
 311
 312 #define TRAP_sig(context)    ((context)->sc_trapno)
 313
 314 #ifdef __NetBSD__
 315 #define ERROR_sig(context)   ((context)->sc_err)
 316 #endif
 317
 318 #ifdef linux
 319 #define ERROR_sig(context)   ((context)->sc_err)
 320 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 321 #define FAULT_ADDRESS        ((void *)HANDLER_CONTEXT->cr2)
 322 #endif
 323
 324 #ifdef __FreeBSD__
 325 #define EFL_sig(context)     ((context)->sc_efl)
 326 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 327 #define FAULT_ADDRESS        ((void *)HANDLER_CONTEXT->sc_err)
 328 #else
 329 #define EFL_sig(context)     ((context)->sc_eflags)
 330 #endif
 331
 332 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 333 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 334
 335 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 336
 337 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 338
 339 #ifdef _SCO_DS
 340 #define gregs regs
 341 #endif
 342
 343 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 344 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 345 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 346 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 347 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 348 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 349 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 350
 351 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 352 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 353 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 354 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 355
 356 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 357 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 358
 359 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 360
 361 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 362 #ifdef R_ESP
 363 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 364 #else
 365 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 366 #endif
 367 #ifdef TRAPNO
 368 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 369 #endif
 370
 371 #define FAULT_ADDRESS         (__siginfo->si_addr)
 372
 373 #endif  /* svr4 || SCO_DS */
 374
 375
 376 /* exception code definitions (already defined by FreeBSD/NetBSD) */
 377 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
 378 #define T_DIVIDE        0   /* Division by zero exception */
 379 #define T_TRCTRAP       1   /* Single-step exception */
 380 #define T_NMI           2   /* NMI interrupt */
 381 #define T_BPTFLT        3   /* Breakpoint exception */
 382 #define T_OFLOW         4   /* Overflow exception */
 383 #define T_BOUND         5   /* Bound range exception */
 384 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 385 #define T_DNA           7   /* Device not available exception */
 386 #define T_DOUBLEFLT     8   /* Double fault exception */
 387 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 388 #define T_TSSFLT        10  /* Invalid TSS exception */
 389 #define T_SEGNPFLT      11  /* Segment not present exception */
 390 #define T_STKFLT        12  /* Stack fault */
 391 #define T_PROTFLT       13  /* General protection fault */
 392 #define T_PAGEFLT       14  /* Page fault */
 393 #define T_RESERVED      15  /* Unknown exception */
 394 #define T_ARITHTRAP     16  /* Floating point exception */
 395 #define T_ALIGNFLT      17  /* Alignment check exception */
 396 #define T_MCHK          18  /* Machine check exception */
 397 #define T_CACHEFLT      19  /* Cache flush exception */
 398 #endif
 399 #if defined(__NetBSD__)
 400 #define T_MCHK          19  /* Machine check exception */
 401 #endif
 402
 403 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 404
 405 #include "wine/exception.h"
 406 #include "stackframe.h"
 407 #include "global.h"
 408 #include "miscemu.h"
 409 #include "syslevel.h"
 410 #include "wine/debug.h"
 411
 412 WINE_DEFAULT_DEBUG_CHANNEL(seh);
 413
 414 typedef int (*wine_signal_handler)(unsigned int sig);
 415
 416 static wine_signal_handler handlers[256];
 417
 418 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
 419
 420 /***********************************************************************
 421  *           dispatch_signal
 422  */
 423 inline static int dispatch_signal(unsigned int sig)
 424 {
 425     if (handlers[sig] == NULL) return 0;
 426     return handlers[sig](sig);
 427 }
 428
 429
 430 /***********************************************************************
 431  *           get_trap_code
 432  *
 433  * Get the trap code for a signal.
 434  */
 435 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 436 {
 437 #ifdef TRAP_sig
 438     return TRAP_sig(sigcontext);
 439 #else
 440     return T_UNKNOWN;  /* unknown trap code */
 441 #endif
 442 }
 443
 444 /***********************************************************************
 445  *           get_error_code
 446  *
 447  * Get the error code for a signal.
 448  */
 449 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 450 {
 451 #ifdef ERROR_sig
 452     return ERROR_sig(sigcontext);
 453 #else
 454     return 0;
 455 #endif
 456 }
 457
 458 #ifdef __HAVE_VM86
 459 /***********************************************************************
 460  *           save_vm86_context
 461  *
 462  * Set the register values from a vm86 structure.
 463  */
 464 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 465 {
 466     context->Eax    = vm86->regs.eax;
 467     context->Ebx    = vm86->regs.ebx;
 468     context->Ecx    = vm86->regs.ecx;
 469     context->Edx    = vm86->regs.edx;
 470     context->Esi    = vm86->regs.esi;
 471     context->Edi    = vm86->regs.edi;
 472     context->Esp    = vm86->regs.esp;
 473     context->Ebp    = vm86->regs.ebp;
 474     context->Eip    = vm86->regs.eip;
 475     context->SegCs  = vm86->regs.cs;
 476     context->SegDs  = vm86->regs.ds;
 477     context->SegEs  = vm86->regs.es;
 478     context->SegFs  = vm86->regs.fs;
 479     context->SegGs  = vm86->regs.gs;
 480     context->SegSs  = vm86->regs.ss;
 481     context->EFlags = vm86->regs.eflags;
 482 }
 483
 484
 485 /***********************************************************************
 486  *           restore_vm86_context
 487  *
 488  * Build a vm86 structure from the register values.
 489  */
 490 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 491 {
 492     vm86->regs.eax    = context->Eax;
 493     vm86->regs.ebx    = context->Ebx;
 494     vm86->regs.ecx    = context->Ecx;
 495     vm86->regs.edx    = context->Edx;
 496     vm86->regs.esi    = context->Esi;
 497     vm86->regs.edi    = context->Edi;
 498     vm86->regs.esp    = context->Esp;
 499     vm86->regs.ebp    = context->Ebp;
 500     vm86->regs.eip    = context->Eip;
 501     vm86->regs.cs     = context->SegCs;
 502     vm86->regs.ds     = context->SegDs;
 503     vm86->regs.es     = context->SegEs;
 504     vm86->regs.fs     = context->SegFs;
 505     vm86->regs.gs     = context->SegGs;
 506     vm86->regs.ss     = context->SegSs;
 507     vm86->regs.eflags = context->EFlags;
 508 }
 509 #endif /* __HAVE_VM86 */
 510
 511
 512 /***********************************************************************
 513  *           save_context
 514  *
 515  * Set the register values from a sigcontext.
 516  */
 517 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 518 {
 519     /* get %fs and %gs at time of the fault */
 520 #ifdef FS_sig
 521     context->SegFs = LOWORD(FS_sig(sigcontext));
 522 #else
 523     context->SegFs = wine_get_fs();
 524 #endif
 525 #ifdef GS_sig
 526     context->SegGs = LOWORD(GS_sig(sigcontext));
 527 #else
 528     context->SegGs = wine_get_gs();
 529 #endif
 530
 531     /* now restore a proper %fs for the fault handler */
 532     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
 533         !IS_SELECTOR_SYSTEM(SS_sig(sigcontext)))  /* 16-bit mode */
 534     {
 535         /*
 536          * Win16 or DOS protected mode. Note that during switch
 537          * from 16-bit mode to linear mode, CS may be set to system
 538          * segment before FS is restored. Fortunately, in this case
 539          * SS is still non-system segment. This is why both CS and SS
 540          * are checked.
 541          */
 542         wine_set_fs( SYSLEVEL_Win16CurrentTeb );
 543         wine_set_gs( NtCurrentTeb()->gs_sel );
 544     }
 545 #ifdef __HAVE_VM86
 546     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 547     {
 548         unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
 549
 550         /* fetch the saved %fs on the stack */
 551         wine_set_fs( stack[0] );
 552         wine_set_gs( stack[1] );
 553         if (EAX_sig(sigcontext) == VM86_EAX) {
 554             /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 555              * (but we could also get if from teb->vm86_ptr) */
 556             struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
 557             /* get context from vm86 struct */
 558             save_vm86_context( context, vm86 );
 559             return;
 560         }
 561     }
 562 #endif  /* __HAVE_VM86 */
 563     else  /* 32-bit mode */
 564     {
 565 #ifdef FS_sig
 566         wine_set_fs( FS_sig(sigcontext) );
 567 #endif
 568 #ifdef GS_sig
 569         wine_set_gs( GS_sig(sigcontext) );
 570 #endif
 571     }
 572
 573     context->Eax    = EAX_sig(sigcontext);
 574     context->Ebx    = EBX_sig(sigcontext);
 575     context->Ecx    = ECX_sig(sigcontext);
 576     context->Edx    = EDX_sig(sigcontext);
 577     context->Esi    = ESI_sig(sigcontext);
 578     context->Edi    = EDI_sig(sigcontext);
 579     context->Ebp    = EBP_sig(sigcontext);
 580     context->EFlags = EFL_sig(sigcontext);
 581     context->Eip    = EIP_sig(sigcontext);
 582     context->Esp    = ESP_sig(sigcontext);
 583     context->SegCs  = LOWORD(CS_sig(sigcontext));
 584     context->SegDs  = LOWORD(DS_sig(sigcontext));
 585     context->SegEs  = LOWORD(ES_sig(sigcontext));
 586     context->SegSs  = LOWORD(SS_sig(sigcontext));
 587 }
 588
 589
 590 /***********************************************************************
 591  *           restore_context
 592  *
 593  * Build a sigcontext from the register values.
 594  */
 595 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 596 {
 597 #ifdef __HAVE_VM86
 598     /* check if exception occurred in vm86 mode */
 599     if ((void *)EIP_sig(sigcontext) == vm86_return &&
 600         IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
 601         EAX_sig(sigcontext) == VM86_EAX)
 602     {
 603         unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
 604         /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 605          * (but we could also get it from teb->vm86_ptr) */
 606         struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
 607         restore_vm86_context( context, vm86 );
 608         return;
 609     }
 610 #endif /* __HAVE_VM86 */
 611
 612     EAX_sig(sigcontext) = context->Eax;
 613     EBX_sig(sigcontext) = context->Ebx;
 614     ECX_sig(sigcontext) = context->Ecx;
 615     EDX_sig(sigcontext) = context->Edx;
 616     ESI_sig(sigcontext) = context->Esi;
 617     EDI_sig(sigcontext) = context->Edi;
 618     EBP_sig(sigcontext) = context->Ebp;
 619     EFL_sig(sigcontext) = context->EFlags;
 620     EIP_sig(sigcontext) = context->Eip;
 621     ESP_sig(sigcontext) = context->Esp;
 622     CS_sig(sigcontext)  = context->SegCs;
 623     DS_sig(sigcontext)  = context->SegDs;
 624     ES_sig(sigcontext)  = context->SegEs;
 625     SS_sig(sigcontext)  = context->SegSs;
 626 #ifdef FS_sig
 627     FS_sig(sigcontext)  = context->SegFs;
 628 #else
 629     wine_set_fs( context->SegFs );
 630 #endif
 631 #ifdef GS_sig
 632     GS_sig(sigcontext)  = context->SegGs;
 633 #else
 634     wine_set_gs( context->SegGs );
 635 #endif
 636 }
 637
 638
 639 /***********************************************************************
 640  *           init_handler
 641  *
 642  * Handler initialization when the full context is not needed.
 643  */
 644 static void init_handler( const SIGCONTEXT *sigcontext )
 645 {
 646     /* restore a proper %fs for the fault handler */
 647     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
 648         !IS_SELECTOR_SYSTEM(SS_sig(sigcontext)))  /* 16-bit mode */
 649     {
 650         wine_set_fs( SYSLEVEL_Win16CurrentTeb );
 651         wine_set_gs( NtCurrentTeb()->gs_sel );
 652     }
 653 #ifdef __HAVE_VM86
 654     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 655     {
 656         /* fetch the saved %fs on the stack */
 657         wine_set_fs( *(unsigned int *)ESP_sig(sigcontext) );
 658         wine_set_gs( NtCurrentTeb()->gs_sel );
 659     }
 660 #endif  /* __HAVE_VM86 */
 661     else  /* 32-bit mode, get %fs at time of the fault */
 662     {
 663 #ifdef FS_sig
 664         wine_set_fs( FS_sig(sigcontext) );
 665 #endif
 666 #ifdef GS_sig
 667         wine_set_gs( GS_sig(sigcontext) );
 668 #endif
 669     }
 670 }
 671
 672
 673 /***********************************************************************
 674  *           save_fpu
 675  *
 676  * Set the FPU context from a sigcontext.
 677  */
 678 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 679 {
 680 #ifdef FPU_sig
 681     if (FPU_sig(sigcontext))
 682     {
 683         context->FloatSave = *FPU_sig(sigcontext);
 684         return;
 685     }
 686 #endif  /* FPU_sig */
 687 #ifdef __GNUC__
 688     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 689 #endif  /* __GNUC__ */
 690 }
 691
 692
 693 /***********************************************************************
 694  *           restore_fpu
 695  *
 696  * Restore the FPU context to a sigcontext.
 697  */
 698 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 699 {
 700     /* reset the current interrupt status */
 701     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 702 #ifdef FPU_sig
 703     if (FPU_sig(sigcontext))
 704     {
 705         *FPU_sig(sigcontext) = context->FloatSave;
 706         return;
 707     }
 708 #endif  /* FPU_sig */
 709 #ifdef __GNUC__
 710     /* avoid nested exceptions */
 711     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 712 #endif  /* __GNUC__ */
 713 }
 714
 715
 716 /**********************************************************************
 717  *              get_fpu_code
 718  *
 719  * Get the FPU exception code from the FPU status.
 720  */
 721 static inline DWORD get_fpu_code( const CONTEXT *context )
 722 {
 723     DWORD status = context->FloatSave.StatusWord;
 724
 725     if (status & 0x01)  /* IE */
 726     {
 727         if (status & 0x40)  /* SF */
 728             return EXCEPTION_FLT_STACK_CHECK;
 729         else
 730             return EXCEPTION_FLT_INVALID_OPERATION;
 731     }
 732     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 733     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 734     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 735     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 736     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 737     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 738 }
 739
 740
 741 /**********************************************************************
 742  *              do_segv
 743  *
 744  * Implementation of SIGSEGV handler.
 745  */
 746 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
 747 {
 748     EXCEPTION_RECORD rec;
 749     DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
 750
 751 #ifdef FAULT_ADDRESS
 752     /* we want the page-fault case to be fast */
 753     if (trap_code == T_PAGEFLT)
 754         if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
 755 #endif
 756
 757     rec.ExceptionRecord  = NULL;
 758     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 759     rec.ExceptionAddress = (LPVOID)context->Eip;
 760     rec.NumberParameters = 0;
 761
 762     switch(trap_code)
 763     {
 764     case T_OFLOW:   /* Overflow exception */
 765         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 766         break;
 767     case T_BOUND:   /* Bound range exception */
 768         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 769         break;
 770     case T_PRIVINFLT:   /* Invalid opcode exception */
 771         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 772         break;
 773     case T_STKFLT:  /* Stack fault */
 774         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 775         break;
 776     case T_SEGNPFLT:  /* Segment not present exception */
 777     case T_PROTFLT:   /* General protection fault */
 778     case T_UNKNOWN:   /* Unknown fault code */
 779         if (!(rec.ExceptionCode = INSTR_EmulateInstruction( context ))) return;
 780         break;
 781     case T_PAGEFLT:  /* Page fault */
 782 #ifdef FAULT_ADDRESS
 783         rec.NumberParameters = 2;
 784         rec.ExceptionInformation[0] = (err_code & 2) != 0;
 785         rec.ExceptionInformation[1] = (DWORD)cr2;
 786 #endif
 787         rec.ExceptionCode = page_fault_code;
 788         break;
 789     case T_ALIGNFLT:  /* Alignment check exception */
 790         /* FIXME: pass through exception handler first? */
 791         if (context->EFlags & 0x00040000)
 792         {
 793             /* Disable AC flag, return */
 794             context->EFlags &= ~0x00040000;
 795             return;
 796         }
 797         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 798         break;
 799     default:
 800         ERR( "Got unexpected trap %d\n", trap_code );
 801         /* fall through */
 802     case T_NMI:       /* NMI interrupt */
 803     case T_DNA:       /* Device not available exception */
 804     case T_DOUBLEFLT: /* Double fault exception */
 805     case T_TSSFLT:    /* Invalid TSS exception */
 806     case T_RESERVED:  /* Unknown exception */
 807     case T_MCHK:      /* Machine check exception */
 808 #ifdef T_CACHEFLT
 809     case T_CACHEFLT:  /* Cache flush exception */
 810 #endif
 811         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 812         break;
 813     }
 814     EXC_RtlRaiseException( &rec, context );
 815 }
 816
 817
 818 /**********************************************************************
 819  *              do_trap
 820  *
 821  * Implementation of SIGTRAP handler.
 822  */
 823 static void do_trap( CONTEXT *context, int trap_code )
 824 {
 825     EXCEPTION_RECORD rec;
 826     DWORD dr0, dr1, dr2, dr3, dr6, dr7;
 827
 828     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 829     rec.ExceptionRecord  = NULL;
 830     rec.ExceptionAddress = (LPVOID)context->Eip;
 831     rec.NumberParameters = 0;
 832
 833     switch(trap_code)
 834     {
 835     case T_TRCTRAP:  /* Single-step exception */
 836         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 837         if (context->EFlags & 0x100)
 838         {
 839             context->EFlags &= ~0x100;  /* clear single-step flag */
 840         }
 841         else  /* hardware breakpoint, fetch the debug registers */
 842         {
 843             context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
 844             NtGetContextThread(GetCurrentThread(), context);
 845             /* do we really have a bp from a debug register ?
 846              * if not, then someone did a kill(SIGTRAP) on us, and we
 847              * shall return a breakpoint, not a single step exception
 848              */
 849             if (!(context->Dr6 & 0xf))
 850                 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 851         }
 852         break;
 853     case T_BPTFLT:   /* Breakpoint exception */
 854         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 855         /* fall through */
 856     default:
 857         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 858         break;
 859     }
 860     dr0 = context->Dr0;
 861     dr1 = context->Dr1;
 862     dr2 = context->Dr2;
 863     dr3 = context->Dr3;
 864     dr6 = context->Dr6;
 865     dr7 = context->Dr7;
 866
 867     EXC_RtlRaiseException( &rec, context );
 868
 869     if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
 870         dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
 871     {
 872         /* the debug registers have changed, set the new values */
 873         context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
 874         NtSetContextThread(GetCurrentThread(), context);
 875     }
 876 }
 877
 878
 879 /**********************************************************************
 880  *              do_fpe
 881  *
 882  * Implementation of SIGFPE handler
 883  */
 884 static void do_fpe( CONTEXT *context, int trap_code )
 885 {
 886     EXCEPTION_RECORD rec;
 887
 888     switch(trap_code)
 889     {
 890     case T_DIVIDE:   /* Division by zero exception */
 891         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 892         break;
 893     case T_FPOPFLT:   /* Coprocessor segment overrun */
 894         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 895         break;
 896     case T_ARITHTRAP:  /* Floating point exception */
 897     case T_UNKNOWN:    /* Unknown fault code */
 898         rec.ExceptionCode = get_fpu_code( context );
 899         break;
 900     default:
 901         ERR( "Got unexpected trap %d\n", trap_code );
 902         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 903         break;
 904     }
 905     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 906     rec.ExceptionRecord  = NULL;
 907     rec.ExceptionAddress = (LPVOID)context->Eip;
 908     rec.NumberParameters = 0;
 909     EXC_RtlRaiseException( &rec, context );
 910 }
 911
 912
 913 #ifdef __HAVE_VM86
 914 /**********************************************************************
 915  *              set_vm86_pend
 916  *
 917  * Handler for SIGUSR2, which we use to set the vm86 pending flag.
 918  */
 919 static void set_vm86_pend( CONTEXT *context )
 920 {
 921     EXCEPTION_RECORD rec;
 922     TEB *teb = NtCurrentTeb();
 923     struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
 924
 925     rec.ExceptionCode           = EXCEPTION_VM86_STI;
 926     rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
 927     rec.ExceptionRecord         = NULL;
 928     rec.NumberParameters        = 1;
 929     rec.ExceptionInformation[0] = 0;
 930
 931     /* __wine_enter_vm86() merges the vm86_pending flag in safely */
 932     teb->vm86_pending |= VIP_MASK;
 933     /* see if we were in VM86 mode */
 934     if (context->EFlags & 0x00020000)
 935     {
 936         /* seems so, also set flag in signal context */
 937         if (context->EFlags & VIP_MASK) return;
 938         context->EFlags |= VIP_MASK;
 939         vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
 940         if (context->EFlags & VIF_MASK) {
 941             /* VIF is set, throw exception */
 942             teb->vm86_pending = 0;
 943             teb->vm86_ptr = NULL;
 944             rec.ExceptionAddress = (LPVOID)context->Eip;
 945             EXC_RtlRaiseException( &rec, context );
 946             teb->vm86_ptr = vm86;
 947         }
 948     }
 949     else if (vm86)
 950     {
 951         /* not in VM86, but possibly setting up for it */
 952         if (vm86->regs.eflags & VIP_MASK) return;
 953         vm86->regs.eflags |= VIP_MASK;
 954         if (((char*)context->Eip >= (char*)vm86_return) &&
 955             ((char*)context->Eip <= (char*)vm86_return_end) &&
 956             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
 957             /* exiting from VM86, can't throw */
 958             return;
 959         }
 960         if (vm86->regs.eflags & VIF_MASK) {
 961             /* VIF is set, throw exception */
 962             CONTEXT vcontext;
 963             teb->vm86_pending = 0;
 964             teb->vm86_ptr = NULL;
 965             save_vm86_context( &vcontext, vm86 );
 966             rec.ExceptionAddress = (LPVOID)vcontext.Eip;
 967             EXC_RtlRaiseException( &rec, &vcontext );
 968             teb->vm86_ptr = vm86;
 969             restore_vm86_context( &vcontext, vm86 );
 970         }
 971     }
 972 }
 973
 974
 975 /**********************************************************************
 976  *              usr2_handler
 977  *
 978  * Handler for SIGUSR2.
 979  * We use it to signal that the running __wine_enter_vm86() should
 980  * immediately set VIP_MASK, causing pending events to be handled
 981  * as early as possible.
 982  */
 983 static HANDLER_DEF(usr2_handler)
 984 {
 985     CONTEXT context;
 986
 987     save_context( &context, HANDLER_CONTEXT );
 988     set_vm86_pend( &context );
 989     restore_context( &context, HANDLER_CONTEXT );
 990 }
 991 #endif /* __HAVE_VM86 */
 992
 993
 994 /**********************************************************************
 995  *              segv_handler
 996  *
 997  * Handler for SIGSEGV and related errors.
 998  */
 999 static HANDLER_DEF(segv_handler)
1000 {
1001     CONTEXT context;
1002     void *cr2;
1003
1004     save_context( &context, HANDLER_CONTEXT );
1005 #ifdef FAULT_ADDRESS
1006     cr2 = FAULT_ADDRESS;
1007 #else
1008     cr2 = NULL;
1009 #endif
1010     do_segv( &context, get_trap_code(HANDLER_CONTEXT), cr2, get_error_code(HANDLER_CONTEXT) );
1011     restore_context( &context, HANDLER_CONTEXT );
1012 }
1013
1014
1015 /**********************************************************************
1016  *              trap_handler
1017  *
1018  * Handler for SIGTRAP.
1019  */
1020 static HANDLER_DEF(trap_handler)
1021 {
1022     CONTEXT context;
1023     save_context( &context, HANDLER_CONTEXT );
1024     do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
1025     restore_context( &context, HANDLER_CONTEXT );
1026 }
1027
1028
1029 /**********************************************************************
1030  *              fpe_handler
1031  *
1032  * Handler for SIGFPE.
1033  */
1034 static HANDLER_DEF(fpe_handler)
1035 {
1036     CONTEXT context;
1037     save_fpu( &context, HANDLER_CONTEXT );
1038     save_context( &context, HANDLER_CONTEXT );
1039     do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
1040     restore_context( &context, HANDLER_CONTEXT );
1041     restore_fpu( &context, HANDLER_CONTEXT );
1042 }
1043
1044
1045 /**********************************************************************
1046  *              int_handler
1047  *
1048  * Handler for SIGINT.
1049  */
1050 static HANDLER_DEF(int_handler)
1051 {
1052     init_handler( HANDLER_CONTEXT );
1053     if (!dispatch_signal(SIGINT))
1054     {
1055         EXCEPTION_RECORD rec;
1056         CONTEXT context;
1057
1058         save_context( &context, HANDLER_CONTEXT );
1059         rec.ExceptionCode    = CONTROL_C_EXIT;
1060         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1061         rec.ExceptionRecord  = NULL;
1062         rec.ExceptionAddress = (LPVOID)context.Eip;
1063         rec.NumberParameters = 0;
1064         EXC_RtlRaiseException( &rec, &context );
1065         restore_context( &context, HANDLER_CONTEXT );
1066     }
1067 }
1068
1069 /**********************************************************************
1070  *              abrt_handler
1071  *
1072  * Handler for SIGABRT.
1073  */
1074 static HANDLER_DEF(abrt_handler)
1075 {
1076     EXCEPTION_RECORD rec;
1077     CONTEXT context;
1078
1079     save_context( &context, HANDLER_CONTEXT );
1080     rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
1081     rec.ExceptionFlags   = EH_NONCONTINUABLE;
1082     rec.ExceptionRecord  = NULL;
1083     rec.ExceptionAddress = (LPVOID)context.Eip;
1084     rec.NumberParameters = 0;
1085     EXC_RtlRaiseException( &rec, &context ); /* Should never return.. */
1086     restore_context( &context, HANDLER_CONTEXT );
1087 }
1088
1089
1090 /**********************************************************************
1091  *              term_handler
1092  *
1093  * Handler for SIGTERM.
1094  */
1095 static HANDLER_DEF(term_handler)
1096 {
1097     init_handler( HANDLER_CONTEXT );
1098     SYSDEPS_AbortThread(0);
1099 }
1100
1101
1102 /**********************************************************************
1103  *              usr1_handler
1104  *
1105  * Handler for SIGUSR1, used to signal a thread that it got suspended.
1106  */
1107 static HANDLER_DEF(usr1_handler)
1108 {
1109     LARGE_INTEGER timeout;
1110
1111     init_handler( HANDLER_CONTEXT );
1112     /* wait with 0 timeout, will only return once the thread is no longer suspended */
1113     timeout.QuadPart = 0;
1114     NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout );
1115 }
1116
1117
1118 /***********************************************************************
1119  *           set_handler
1120  *
1121  * Set a signal handler
1122  */
1123 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1124 {
1125     struct sigaction sig_act;
1126
1127 #ifdef linux
1128     if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
1129     {
1130         struct kernel_sigaction sig_act;
1131         sig_act.ksa_handler = func;
1132         sig_act.ksa_flags   = SA_RESTART;
1133         sig_act.ksa_mask    = (1 << (SIGINT-1)) |
1134                               (1 << (SIGUSR2-1));
1135         /* point to the top of the stack */
1136         sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
1137         return wine_sigaction( sig, &sig_act, NULL );
1138     }
1139 #endif  /* linux */
1140     sig_act.sa_handler = func;
1141     sigemptyset( &sig_act.sa_mask );
1142     sigaddset( &sig_act.sa_mask, SIGINT );
1143     sigaddset( &sig_act.sa_mask, SIGUSR2 );
1144
1145 #if defined(linux) || defined(__NetBSD__)
1146     sig_act.sa_flags = SA_RESTART;
1147 #elif defined (__svr4__) || defined(_SCO_DS)
1148     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1149 #else
1150     sig_act.sa_flags = 0;
1151 #endif
1152
1153 #ifdef SA_ONSTACK
1154     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1155 #endif
1156     return sigaction( sig, &sig_act, NULL );
1157 }
1158
1159
1160 /***********************************************************************
1161  *           __wine_set_signal_handler   (NTDLL.@)
1162  */
1163 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1164 {
1165     if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1166     if (handlers[sig] != NULL) return -2;
1167     handlers[sig] = wsh;
1168     return 0;
1169 }
1170
1171
1172 /**********************************************************************
1173  *              SIGNAL_Init
1174  */
1175 BOOL SIGNAL_Init(void)
1176 {
1177     int have_sigaltstack = 0;
1178
1179 #ifdef HAVE_SIGALTSTACK
1180     struct sigaltstack ss;
1181     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1182     {
1183         ss.ss_size  = SIGNAL_STACK_SIZE;
1184         ss.ss_flags = 0;
1185         if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1186 #ifdef linux
1187         /* sigaltstack may fail because the kernel is too old, or
1188            because glibc is brain-dead. In the latter case a
1189            direct system call should succeed. */
1190         else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1191 #endif  /* linux */
1192     }
1193 #endif  /* HAVE_SIGALTSTACK */
1194
1195     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1196     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1197     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1198     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1199     if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1200     if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1201     if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1202 #ifdef SIGBUS
1203     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1204 #endif
1205 #ifdef SIGTRAP
1206     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1207 #endif
1208
1209 #ifdef __HAVE_VM86
1210     if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1211 #endif
1212
1213     return TRUE;
1214
1215  error:
1216     perror("sigaction");
1217     return FALSE;
1218 }
1219
1220
1221 /**********************************************************************
1222  *              SIGNAL_Block
1223  *
1224  * Block the async signals.
1225  */
1226 void SIGNAL_Block(void)
1227 {
1228     sigset_t block_set;
1229
1230     sigemptyset( &block_set );
1231     sigaddset( &block_set, SIGIO );
1232     sigaddset( &block_set, SIGHUP );
1233     sigaddset( &block_set, SIGUSR1 );
1234     sigaddset( &block_set, SIGUSR2 );
1235     sigprocmask( SIG_BLOCK, &block_set, NULL );
1236 }
1237
1238
1239 /***********************************************************************
1240  *           SIGNAL_Unblock
1241  *
1242  * Unblock signals. Called from EXC_RtlRaiseException.
1243  */
1244 void SIGNAL_Unblock(void)
1245 {
1246     sigset_t all_sigs;
1247
1248     sigfillset( &all_sigs );
1249     sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
1250 }
1251
1252
1253 /**********************************************************************
1254  *              SIGNAL_Reset
1255  *
1256  * Restore the default handlers.
1257  */
1258 void SIGNAL_Reset(void)
1259 {
1260     signal( SIGINT, SIG_DFL );
1261     signal( SIGFPE, SIG_DFL );
1262     signal( SIGSEGV, SIG_DFL );
1263     signal( SIGILL, SIG_DFL );
1264     signal( SIGABRT, SIG_DFL );
1265     signal( SIGTERM, SIG_DFL );
1266 #ifdef SIGBUS
1267     signal( SIGBUS, SIG_DFL );
1268 #endif
1269 #ifdef SIGTRAP
1270     signal( SIGTRAP, SIG_DFL );
1271 #endif
1272 }
1273
1274
1275 #ifdef __HAVE_VM86
1276 /**********************************************************************
1277  *              __wine_enter_vm86   (NTDLL.@)
1278  *
1279  * Enter vm86 mode with the specified register context.
1280  */
1281 void __wine_enter_vm86( CONTEXT *context )
1282 {
1283     EXCEPTION_RECORD rec;
1284     TEB *teb = NtCurrentTeb();
1285     int res;
1286     struct vm86plus_struct vm86;
1287
1288     memset( &vm86, 0, sizeof(vm86) );
1289     for (;;)
1290     {
1291         restore_vm86_context( context, &vm86 );
1292         /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1293          * so save it on entry, just in case */
1294         teb->vm86_pending |= (context->EFlags & VIP_MASK);
1295         /* Work around race conditions with signal handler
1296          * (avoiding sigprocmask for performance reasons) */
1297         teb->vm86_ptr = &vm86;
1298         vm86.regs.eflags |= teb->vm86_pending;
1299         /* Check for VIF|VIP here, since vm86_enter doesn't */
1300         if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1301             teb->vm86_ptr = NULL;
1302             teb->vm86_pending = 0;
1303             context->EFlags |= VIP_MASK;
1304             rec.ExceptionCode = EXCEPTION_VM86_STI;
1305             rec.ExceptionInformation[0] = 0;
1306             goto cancel_vm86;
1307         }
1308
1309         do
1310         {
1311             res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1312             if (res < 0)
1313             {
1314                 errno = -res;
1315                 return;
1316             }
1317         } while (VM86_TYPE(res) == VM86_SIGNAL);
1318
1319         save_vm86_context( context, &vm86 );
1320         context->EFlags |= teb->vm86_pending;
1321
1322         switch(VM86_TYPE(res))
1323         {
1324         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1325             do_segv( context, T_PROTFLT, 0, 0 );
1326             continue;
1327         case VM86_TRAP: /* return due to DOS-debugger request */
1328             do_trap( context, VM86_ARG(res) );
1329             continue;
1330         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1331             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1332             break;
1333         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1334             teb->vm86_pending = 0;
1335             rec.ExceptionCode = EXCEPTION_VM86_STI;
1336             break;
1337         case VM86_PICRETURN: /* return due to pending PIC request */
1338             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1339             break;
1340         default:
1341             ERR( "unhandled result from vm86 mode %x\n", res );
1342             continue;
1343         }
1344         rec.ExceptionInformation[0] = VM86_ARG(res);
1345 cancel_vm86:
1346         rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
1347         rec.ExceptionRecord         = NULL;
1348         rec.ExceptionAddress        = (LPVOID)context->Eip;
1349         rec.NumberParameters        = 1;
1350         EXC_RtlRaiseException( &rec, context );
1351     }
1352 }
1353
1354 #else /* __HAVE_VM86 */
1355 /**********************************************************************
1356  *              __wine_enter_vm86   (NTDLL.@)
1357  */
1358 void __wine_enter_vm86( CONTEXT *context )
1359 {
1360     MESSAGE("vm86 mode not supported on this platform\n");
1361 }
1362 #endif /* __HAVE_VM86 */
1363
1364 /**********************************************************************
1365  *              DbgBreakPoint   (NTDLL.@)
1366  */
1367 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1368
1369 /**********************************************************************
1370  *              DbgUserBreakPoint   (NTDLL.@)
1371  */
1372 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1373
1374 #endif  /* __i386__ */