dlls/ntdll/signal_i386.c

   1 /*
   2  * i386 signal handling routines
   3  *
   4  * Copyright 1999 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifdef __i386__
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <errno.h>
  27 #include <signal.h>
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #ifdef HAVE_UNISTD_H
  31 # include <unistd.h>
  32 #endif
  33
  34 #ifdef HAVE_SYS_PARAM_H
  35 # include <sys/param.h>
  36 #endif
  37 #ifdef HAVE_SYSCALL_H
  38 # include <syscall.h>
  39 #else
  40 # ifdef HAVE_SYS_SYSCALL_H
  41 #  include <sys/syscall.h>
  42 # endif
  43 #endif
  44
  45 #ifdef HAVE_SYS_VM86_H
  46 # include <sys/vm86.h>
  47 #endif
  48
  49 #ifdef HAVE_SYS_SIGNAL_H
  50 # include <sys/signal.h>
  51 #endif
  52
  53 #include "windef.h"
  54 #include "winternl.h"
  55 #include "wine/library.h"
  56
  57 #include "selectors.h"
  58
  59 /***********************************************************************
  60  * signal context platform-specific definitions
  61  */
  62
  63 #ifdef linux
  64 typedef struct
  65 {
  66     unsigned short sc_gs, __gsh;
  67     unsigned short sc_fs, __fsh;
  68     unsigned short sc_es, __esh;
  69     unsigned short sc_ds, __dsh;
  70     unsigned long sc_edi;
  71     unsigned long sc_esi;
  72     unsigned long sc_ebp;
  73     unsigned long sc_esp;
  74     unsigned long sc_ebx;
  75     unsigned long sc_edx;
  76     unsigned long sc_ecx;
  77     unsigned long sc_eax;
  78     unsigned long sc_trapno;
  79     unsigned long sc_err;
  80     unsigned long sc_eip;
  81     unsigned short sc_cs, __csh;
  82     unsigned long sc_eflags;
  83     unsigned long esp_at_signal;
  84     unsigned short sc_ss, __ssh;
  85     unsigned long i387;
  86     unsigned long oldmask;
  87     unsigned long cr2;
  88 } SIGCONTEXT;
  89
  90 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
  91 #define HANDLER_CONTEXT (&__context)
  92
  93 /* this is the sigaction structure from the Linux 2.1.20 kernel.  */
  94 struct kernel_sigaction
  95 {
  96     void (*ksa_handler)();
  97     unsigned long ksa_mask;
  98     unsigned long ksa_flags;
  99     void *ksa_restorer;
 100 };
 101
 102 /* Similar to the sigaction function in libc, except it leaves alone the
 103    restorer field, which is used to specify the signal stack address */
 104 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
 105                                   struct kernel_sigaction *old )
 106 {
 107     __asm__ __volatile__( "pushl %%ebx\n\t"
 108                           "movl %2,%%ebx\n\t"
 109                           "int $0x80\n\t"
 110                           "popl %%ebx"
 111                           : "=a" (sig)
 112                           : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
 113     if (sig>=0) return 0;
 114     errno = -sig;
 115     return -1;
 116 }
 117
 118 #ifdef HAVE_SIGALTSTACK
 119 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
 120 static inline int wine_sigaltstack( const struct sigaltstack *new,
 121                                     struct sigaltstack *old )
 122 {
 123     int ret;
 124     __asm__ __volatile__( "pushl %%ebx\n\t"
 125                           "movl %2,%%ebx\n\t"
 126                           "int $0x80\n\t"
 127                           "popl %%ebx"
 128                           : "=a" (ret)
 129                           : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
 130     if (ret >= 0) return 0;
 131     errno = -ret;
 132     return -1;
 133 }
 134 #endif
 135
 136 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
 137
 138 int vm86_enter( void **vm86_ptr );
 139 void vm86_return(void);
 140 void vm86_return_end(void);
 141 __ASM_GLOBAL_FUNC(vm86_enter,
 142                   "pushl %ebp\n\t"
 143                   "movl %esp, %ebp\n\t"
 144                   "movl $166,%eax\n\t"  /*SYS_vm86*/
 145                   "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
 146                   "movl (%ecx),%ecx\n\t"
 147                   "pushl %ebx\n\t"
 148                   "movl $1,%ebx\n\t"    /*VM86_ENTER*/
 149                   "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
 150                   "pushl %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 CR2_sig(context)     ((context)->cr2)
 320 #define ERROR_sig(context)   ((context)->sc_err)
 321 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 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 CR2_sig(context)     ((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 #endif  /* svr4 || SCO_DS */
 372
 373
 374 /* exception code definitions (already defined by FreeBSD/NetBSD) */
 375 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
 376 #define T_DIVIDE        0   /* Division by zero exception */
 377 #define T_TRCTRAP       1   /* Single-step exception */
 378 #define T_NMI           2   /* NMI interrupt */
 379 #define T_BPTFLT        3   /* Breakpoint exception */
 380 #define T_OFLOW         4   /* Overflow exception */
 381 #define T_BOUND         5   /* Bound range exception */
 382 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 383 #define T_DNA           7   /* Device not available exception */
 384 #define T_DOUBLEFLT     8   /* Double fault exception */
 385 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 386 #define T_TSSFLT        10  /* Invalid TSS exception */
 387 #define T_SEGNPFLT      11  /* Segment not present exception */
 388 #define T_STKFLT        12  /* Stack fault */
 389 #define T_PROTFLT       13  /* General protection fault */
 390 #define T_PAGEFLT       14  /* Page fault */
 391 #define T_RESERVED      15  /* Unknown exception */
 392 #define T_ARITHTRAP     16  /* Floating point exception */
 393 #define T_ALIGNFLT      17  /* Alignment check exception */
 394 #define T_MCHK          18  /* Machine check exception */
 395 #define T_CACHEFLT      19  /* Cache flush exception */
 396 #endif
 397 #if defined(__NetBSD__)
 398 #define T_MCHK          19  /* Machine check exception */
 399 #endif
 400
 401 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 402
 403 #include "wine/exception.h"
 404 #include "stackframe.h"
 405 #include "global.h"
 406 #include "miscemu.h"
 407 #include "syslevel.h"
 408 #include "wine/debug.h"
 409
 410 WINE_DEFAULT_DEBUG_CHANNEL(seh);
 411
 412 typedef int (*wine_signal_handler)(unsigned int sig);
 413
 414 static wine_signal_handler handlers[256];
 415
 416 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
 417
 418 /***********************************************************************
 419  *           dispatch_signal
 420  */
 421 inline static int dispatch_signal(unsigned int sig)
 422 {
 423     if (handlers[sig] == NULL) return 0;
 424     return handlers[sig](sig);
 425 }
 426
 427
 428 /***********************************************************************
 429  *           get_trap_code
 430  *
 431  * Get the trap code for a signal.
 432  */
 433 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 434 {
 435 #ifdef TRAP_sig
 436     return TRAP_sig(sigcontext);
 437 #else
 438     return T_UNKNOWN;  /* unknown trap code */
 439 #endif
 440 }
 441
 442 /***********************************************************************
 443  *           get_error_code
 444  *
 445  * Get the error code for a signal.
 446  */
 447 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 448 {
 449 #ifdef ERROR_sig
 450     return ERROR_sig(sigcontext);
 451 #else
 452     return 0;
 453 #endif
 454 }
 455
 456 /***********************************************************************
 457  *           get_cr2_value
 458  *
 459  * Get the CR2 value for a signal.
 460  */
 461 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
 462 {
 463 #ifdef CR2_sig
 464     return (void *)CR2_sig(sigcontext);
 465 #else
 466     return NULL;
 467 #endif
 468 }
 469
 470
 471 #ifdef __HAVE_VM86
 472 /***********************************************************************
 473  *           save_vm86_context
 474  *
 475  * Set the register values from a vm86 structure.
 476  */
 477 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 478 {
 479     context->Eax    = vm86->regs.eax;
 480     context->Ebx    = vm86->regs.ebx;
 481     context->Ecx    = vm86->regs.ecx;
 482     context->Edx    = vm86->regs.edx;
 483     context->Esi    = vm86->regs.esi;
 484     context->Edi    = vm86->regs.edi;
 485     context->Esp    = vm86->regs.esp;
 486     context->Ebp    = vm86->regs.ebp;
 487     context->Eip    = vm86->regs.eip;
 488     context->SegCs  = vm86->regs.cs;
 489     context->SegDs  = vm86->regs.ds;
 490     context->SegEs  = vm86->regs.es;
 491     context->SegFs  = vm86->regs.fs;
 492     context->SegGs  = vm86->regs.gs;
 493     context->SegSs  = vm86->regs.ss;
 494     context->EFlags = vm86->regs.eflags;
 495 }
 496
 497
 498 /***********************************************************************
 499  *           restore_vm86_context
 500  *
 501  * Build a vm86 structure from the register values.
 502  */
 503 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 504 {
 505     vm86->regs.eax    = context->Eax;
 506     vm86->regs.ebx    = context->Ebx;
 507     vm86->regs.ecx    = context->Ecx;
 508     vm86->regs.edx    = context->Edx;
 509     vm86->regs.esi    = context->Esi;
 510     vm86->regs.edi    = context->Edi;
 511     vm86->regs.esp    = context->Esp;
 512     vm86->regs.ebp    = context->Ebp;
 513     vm86->regs.eip    = context->Eip;
 514     vm86->regs.cs     = context->SegCs;
 515     vm86->regs.ds     = context->SegDs;
 516     vm86->regs.es     = context->SegEs;
 517     vm86->regs.fs     = context->SegFs;
 518     vm86->regs.gs     = context->SegGs;
 519     vm86->regs.ss     = context->SegSs;
 520     vm86->regs.eflags = context->EFlags;
 521 }
 522 #endif /* __HAVE_VM86 */
 523
 524
 525 /***********************************************************************
 526  *           save_context
 527  *
 528  * Set the register values from a sigcontext.
 529  */
 530 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 531 {
 532     /* get %fs and %gs at time of the fault */
 533 #ifdef FS_sig
 534     context->SegFs = LOWORD(FS_sig(sigcontext));
 535 #else
 536     context->SegFs = wine_get_fs();
 537 #endif
 538 #ifdef GS_sig
 539     context->SegGs = LOWORD(GS_sig(sigcontext));
 540 #else
 541     context->SegGs = wine_get_gs();
 542 #endif
 543
 544     /* now restore a proper %fs for the fault handler */
 545     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
 546         !IS_SELECTOR_SYSTEM(SS_sig(sigcontext)))  /* 16-bit mode */
 547     {
 548         /*
 549          * Win16 or DOS protected mode. Note that during switch
 550          * from 16-bit mode to linear mode, CS may be set to system
 551          * segment before FS is restored. Fortunately, in this case
 552          * SS is still non-system segment. This is why both CS and SS
 553          * are checked.
 554          */
 555         wine_set_fs( SYSLEVEL_Win16CurrentTeb );
 556         wine_set_gs( NtCurrentTeb()->gs_sel );
 557     }
 558 #ifdef __HAVE_VM86
 559     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 560     {
 561         unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
 562
 563         /* fetch the saved %fs on the stack */
 564         wine_set_fs( stack[0] );
 565         wine_set_gs( stack[1] );
 566         if (EAX_sig(sigcontext) == VM86_EAX) {
 567             /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 568              * (but we could also get if from teb->vm86_ptr) */
 569             struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
 570             /* get context from vm86 struct */
 571             save_vm86_context( context, vm86 );
 572             return;
 573         }
 574     }
 575 #endif  /* __HAVE_VM86 */
 576     else  /* 32-bit mode */
 577     {
 578 #ifdef FS_sig
 579         wine_set_fs( FS_sig(sigcontext) );
 580 #endif
 581 #ifdef GS_sig
 582         wine_set_gs( GS_sig(sigcontext) );
 583 #endif
 584     }
 585
 586     context->Eax    = EAX_sig(sigcontext);
 587     context->Ebx    = EBX_sig(sigcontext);
 588     context->Ecx    = ECX_sig(sigcontext);
 589     context->Edx    = EDX_sig(sigcontext);
 590     context->Esi    = ESI_sig(sigcontext);
 591     context->Edi    = EDI_sig(sigcontext);
 592     context->Ebp    = EBP_sig(sigcontext);
 593     context->EFlags = EFL_sig(sigcontext);
 594     context->Eip    = EIP_sig(sigcontext);
 595     context->Esp    = ESP_sig(sigcontext);
 596     context->SegCs  = LOWORD(CS_sig(sigcontext));
 597     context->SegDs  = LOWORD(DS_sig(sigcontext));
 598     context->SegEs  = LOWORD(ES_sig(sigcontext));
 599     context->SegSs  = LOWORD(SS_sig(sigcontext));
 600 }
 601
 602
 603 /***********************************************************************
 604  *           restore_context
 605  *
 606  * Build a sigcontext from the register values.
 607  */
 608 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 609 {
 610 #ifdef __HAVE_VM86
 611     /* check if exception occurred in vm86 mode */
 612     if ((void *)EIP_sig(sigcontext) == vm86_return &&
 613         IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
 614         EAX_sig(sigcontext) == VM86_EAX)
 615     {
 616         unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
 617         /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 618          * (but we could also get it from teb->vm86_ptr) */
 619         struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
 620         restore_vm86_context( context, vm86 );
 621         return;
 622     }
 623 #endif /* __HAVE_VM86 */
 624
 625     EAX_sig(sigcontext) = context->Eax;
 626     EBX_sig(sigcontext) = context->Ebx;
 627     ECX_sig(sigcontext) = context->Ecx;
 628     EDX_sig(sigcontext) = context->Edx;
 629     ESI_sig(sigcontext) = context->Esi;
 630     EDI_sig(sigcontext) = context->Edi;
 631     EBP_sig(sigcontext) = context->Ebp;
 632     EFL_sig(sigcontext) = context->EFlags;
 633     EIP_sig(sigcontext) = context->Eip;
 634     ESP_sig(sigcontext) = context->Esp;
 635     CS_sig(sigcontext)  = context->SegCs;
 636     DS_sig(sigcontext)  = context->SegDs;
 637     ES_sig(sigcontext)  = context->SegEs;
 638     SS_sig(sigcontext)  = context->SegSs;
 639 #ifdef FS_sig
 640     FS_sig(sigcontext)  = context->SegFs;
 641 #else
 642     wine_set_fs( context->SegFs );
 643 #endif
 644 #ifdef GS_sig
 645     GS_sig(sigcontext)  = context->SegGs;
 646 #else
 647     wine_set_gs( context->SegGs );
 648 #endif
 649 }
 650
 651
 652 /***********************************************************************
 653  *           init_handler
 654  *
 655  * Handler initialization when the full context is not needed.
 656  */
 657 static void init_handler( const SIGCONTEXT *sigcontext )
 658 {
 659     /* restore a proper %fs for the fault handler */
 660     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
 661         !IS_SELECTOR_SYSTEM(SS_sig(sigcontext)))  /* 16-bit mode */
 662     {
 663         wine_set_fs( SYSLEVEL_Win16CurrentTeb );
 664         wine_set_gs( NtCurrentTeb()->gs_sel );
 665     }
 666 #ifdef __HAVE_VM86
 667     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 668     {
 669         /* fetch the saved %fs on the stack */
 670         wine_set_fs( *(unsigned int *)ESP_sig(sigcontext) );
 671         wine_set_gs( NtCurrentTeb()->gs_sel );
 672     }
 673 #endif  /* __HAVE_VM86 */
 674     else  /* 32-bit mode, get %fs at time of the fault */
 675     {
 676 #ifdef FS_sig
 677         wine_set_fs( FS_sig(sigcontext) );
 678 #endif
 679 #ifdef GS_sig
 680         wine_set_gs( GS_sig(sigcontext) );
 681 #endif
 682     }
 683 }
 684
 685
 686 /***********************************************************************
 687  *           save_fpu
 688  *
 689  * Set the FPU context from a sigcontext.
 690  */
 691 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 692 {
 693 #ifdef FPU_sig
 694     if (FPU_sig(sigcontext))
 695     {
 696         context->FloatSave = *FPU_sig(sigcontext);
 697         return;
 698     }
 699 #endif  /* FPU_sig */
 700 #ifdef __GNUC__
 701     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 702 #endif  /* __GNUC__ */
 703 }
 704
 705
 706 /***********************************************************************
 707  *           restore_fpu
 708  *
 709  * Restore the FPU context to a sigcontext.
 710  */
 711 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 712 {
 713     /* reset the current interrupt status */
 714     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 715 #ifdef FPU_sig
 716     if (FPU_sig(sigcontext))
 717     {
 718         *FPU_sig(sigcontext) = context->FloatSave;
 719         return;
 720     }
 721 #endif  /* FPU_sig */
 722 #ifdef __GNUC__
 723     /* avoid nested exceptions */
 724     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 725 #endif  /* __GNUC__ */
 726 }
 727
 728
 729 /**********************************************************************
 730  *              get_fpu_code
 731  *
 732  * Get the FPU exception code from the FPU status.
 733  */
 734 static inline DWORD get_fpu_code( const CONTEXT *context )
 735 {
 736     DWORD status = context->FloatSave.StatusWord;
 737
 738     if (status & 0x01)  /* IE */
 739     {
 740         if (status & 0x40)  /* SF */
 741             return EXCEPTION_FLT_STACK_CHECK;
 742         else
 743             return EXCEPTION_FLT_INVALID_OPERATION;
 744     }
 745     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 746     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 747     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 748     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 749     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 750     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 751 }
 752
 753
 754 /**********************************************************************
 755  *              do_segv
 756  *
 757  * Implementation of SIGSEGV handler.
 758  */
 759 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
 760 {
 761     EXCEPTION_RECORD rec;
 762     DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
 763
 764 #ifdef CR2_sig
 765     /* we want the page-fault case to be fast */
 766     if (trap_code == T_PAGEFLT)
 767         if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
 768 #endif
 769
 770     rec.ExceptionRecord  = NULL;
 771     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 772     rec.ExceptionAddress = (LPVOID)context->Eip;
 773     rec.NumberParameters = 0;
 774
 775     switch(trap_code)
 776     {
 777     case T_OFLOW:   /* Overflow exception */
 778         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 779         break;
 780     case T_BOUND:   /* Bound range exception */
 781         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 782         break;
 783     case T_PRIVINFLT:   /* Invalid opcode exception */
 784         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 785         break;
 786     case T_STKFLT:  /* Stack fault */
 787         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 788         break;
 789     case T_SEGNPFLT:  /* Segment not present exception */
 790     case T_PROTFLT:   /* General protection fault */
 791     case T_UNKNOWN:   /* Unknown fault code */
 792         if (INSTR_EmulateInstruction( context )) return;
 793         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 794         break;
 795     case T_PAGEFLT:  /* Page fault */
 796 #ifdef CR2_sig
 797         rec.NumberParameters = 2;
 798         rec.ExceptionInformation[0] = (err_code & 2) != 0;
 799         rec.ExceptionInformation[1] = (DWORD)cr2;
 800 #endif /* CR2_sig */
 801         rec.ExceptionCode = page_fault_code;
 802         break;
 803     case T_ALIGNFLT:  /* Alignment check exception */
 804         /* FIXME: pass through exception handler first? */
 805         if (context->EFlags & 0x00040000)
 806         {
 807             /* Disable AC flag, return */
 808             context->EFlags &= ~0x00040000;
 809             return;
 810         }
 811         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 812         break;
 813     default:
 814         ERR( "Got unexpected trap %d\n", trap_code );
 815         /* fall through */
 816     case T_NMI:       /* NMI interrupt */
 817     case T_DNA:       /* Device not available exception */
 818     case T_DOUBLEFLT: /* Double fault exception */
 819     case T_TSSFLT:    /* Invalid TSS exception */
 820     case T_RESERVED:  /* Unknown exception */
 821     case T_MCHK:      /* Machine check exception */
 822 #ifdef T_CACHEFLT
 823     case T_CACHEFLT:  /* Cache flush exception */
 824 #endif
 825         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 826         break;
 827     }
 828     EXC_RtlRaiseException( &rec, context );
 829 }
 830
 831
 832 /**********************************************************************
 833  *              do_trap
 834  *
 835  * Implementation of SIGTRAP handler.
 836  */
 837 static void do_trap( CONTEXT *context, int trap_code )
 838 {
 839     EXCEPTION_RECORD rec;
 840     DWORD dr0, dr1, dr2, dr3, dr6, dr7;
 841
 842     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 843     rec.ExceptionRecord  = NULL;
 844     rec.ExceptionAddress = (LPVOID)context->Eip;
 845     rec.NumberParameters = 0;
 846
 847     switch(trap_code)
 848     {
 849     case T_TRCTRAP:  /* Single-step exception */
 850         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 851         if (context->EFlags & 0x100)
 852         {
 853             context->EFlags &= ~0x100;  /* clear single-step flag */
 854         }
 855         else  /* hardware breakpoint, fetch the debug registers */
 856         {
 857             context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
 858             NtGetContextThread(GetCurrentThread(), context);
 859         }
 860         break;
 861     case T_BPTFLT:   /* Breakpoint exception */
 862         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 863         /* fall through */
 864     default:
 865         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 866         break;
 867     }
 868     dr0 = context->Dr0;
 869     dr1 = context->Dr1;
 870     dr2 = context->Dr2;
 871     dr3 = context->Dr3;
 872     dr6 = context->Dr6;
 873     dr7 = context->Dr7;
 874
 875     EXC_RtlRaiseException( &rec, context );
 876
 877     if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
 878         dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
 879     {
 880         /* the debug registers have changed, set the new values */
 881         context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
 882         NtSetContextThread(GetCurrentThread(), context);
 883     }
 884 }
 885
 886
 887 /**********************************************************************
 888  *              do_fpe
 889  *
 890  * Implementation of SIGFPE handler
 891  */
 892 static void do_fpe( CONTEXT *context, int trap_code )
 893 {
 894     EXCEPTION_RECORD rec;
 895
 896     switch(trap_code)
 897     {
 898     case T_DIVIDE:   /* Division by zero exception */
 899         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 900         break;
 901     case T_FPOPFLT:   /* Coprocessor segment overrun */
 902         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 903         break;
 904     case T_ARITHTRAP:  /* Floating point exception */
 905     case T_UNKNOWN:    /* Unknown fault code */
 906         rec.ExceptionCode = get_fpu_code( context );
 907         break;
 908     default:
 909         ERR( "Got unexpected trap %d\n", trap_code );
 910         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 911         break;
 912     }
 913     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 914     rec.ExceptionRecord  = NULL;
 915     rec.ExceptionAddress = (LPVOID)context->Eip;
 916     rec.NumberParameters = 0;
 917     EXC_RtlRaiseException( &rec, context );
 918 }
 919
 920
 921 #ifdef __HAVE_VM86
 922 /**********************************************************************
 923  *              set_vm86_pend
 924  *
 925  * Handler for SIGUSR2, which we use to set the vm86 pending flag.
 926  */
 927 static void set_vm86_pend( CONTEXT *context )
 928 {
 929     EXCEPTION_RECORD rec;
 930     TEB *teb = NtCurrentTeb();
 931     struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
 932
 933     rec.ExceptionCode           = EXCEPTION_VM86_STI;
 934     rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
 935     rec.ExceptionRecord         = NULL;
 936     rec.NumberParameters        = 1;
 937     rec.ExceptionInformation[0] = 0;
 938
 939     /* __wine_enter_vm86() merges the vm86_pending flag in safely */
 940     teb->vm86_pending |= VIP_MASK;
 941     /* see if we were in VM86 mode */
 942     if (context->EFlags & 0x00020000)
 943     {
 944         /* seems so, also set flag in signal context */
 945         if (context->EFlags & VIP_MASK) return;
 946         context->EFlags |= VIP_MASK;
 947         vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
 948         if (context->EFlags & VIF_MASK) {
 949             /* VIF is set, throw exception */
 950             teb->vm86_pending = 0;
 951             teb->vm86_ptr = NULL;
 952             rec.ExceptionAddress = (LPVOID)context->Eip;
 953             EXC_RtlRaiseException( &rec, context );
 954             teb->vm86_ptr = vm86;
 955         }
 956     }
 957     else if (vm86)
 958     {
 959         /* not in VM86, but possibly setting up for it */
 960         if (vm86->regs.eflags & VIP_MASK) return;
 961         vm86->regs.eflags |= VIP_MASK;
 962         if (((char*)context->Eip >= (char*)vm86_return) &&
 963             ((char*)context->Eip <= (char*)vm86_return_end) &&
 964             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
 965             /* exiting from VM86, can't throw */
 966             return;
 967         }
 968         if (vm86->regs.eflags & VIF_MASK) {
 969             /* VIF is set, throw exception */
 970             CONTEXT vcontext;
 971             teb->vm86_pending = 0;
 972             teb->vm86_ptr = NULL;
 973             save_vm86_context( &vcontext, vm86 );
 974             rec.ExceptionAddress = (LPVOID)vcontext.Eip;
 975             EXC_RtlRaiseException( &rec, &vcontext );
 976             teb->vm86_ptr = vm86;
 977             restore_vm86_context( &vcontext, vm86 );
 978         }
 979     }
 980 }
 981
 982
 983 /**********************************************************************
 984  *              usr2_handler
 985  *
 986  * Handler for SIGUSR2.
 987  * We use it to signal that the running __wine_enter_vm86() should
 988  * immediately set VIP_MASK, causing pending events to be handled
 989  * as early as possible.
 990  */
 991 static HANDLER_DEF(usr2_handler)
 992 {
 993     CONTEXT context;
 994
 995     save_context( &context, HANDLER_CONTEXT );
 996     set_vm86_pend( &context );
 997     restore_context( &context, HANDLER_CONTEXT );
 998 }
 999
1000
1001 /**********************************************************************
1002  *              alrm_handler
1003  *
1004  * Handler for SIGALRM.
1005  * Increases the alarm counter and sets the vm86 pending flag.
1006  */
1007 static HANDLER_DEF(alrm_handler)
1008 {
1009     CONTEXT context;
1010
1011     save_context( &context, HANDLER_CONTEXT );
1012     NtCurrentTeb()->alarms++;
1013     set_vm86_pend( &context );
1014     restore_context( &context, HANDLER_CONTEXT );
1015 }
1016 #endif /* __HAVE_VM86 */
1017
1018
1019 /**********************************************************************
1020  *              segv_handler
1021  *
1022  * Handler for SIGSEGV and related errors.
1023  */
1024 static HANDLER_DEF(segv_handler)
1025 {
1026     CONTEXT context;
1027     save_context( &context, HANDLER_CONTEXT );
1028     do_segv( &context, get_trap_code(HANDLER_CONTEXT),
1029              get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
1030     restore_context( &context, HANDLER_CONTEXT );
1031 }
1032
1033
1034 /**********************************************************************
1035  *              trap_handler
1036  *
1037  * Handler for SIGTRAP.
1038  */
1039 static HANDLER_DEF(trap_handler)
1040 {
1041     CONTEXT context;
1042     save_context( &context, HANDLER_CONTEXT );
1043     do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
1044     restore_context( &context, HANDLER_CONTEXT );
1045 }
1046
1047
1048 /**********************************************************************
1049  *              fpe_handler
1050  *
1051  * Handler for SIGFPE.
1052  */
1053 static HANDLER_DEF(fpe_handler)
1054 {
1055     CONTEXT context;
1056     save_fpu( &context, HANDLER_CONTEXT );
1057     save_context( &context, HANDLER_CONTEXT );
1058     do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
1059     restore_context( &context, HANDLER_CONTEXT );
1060     restore_fpu( &context, HANDLER_CONTEXT );
1061 }
1062
1063
1064 /**********************************************************************
1065  *              int_handler
1066  *
1067  * Handler for SIGINT.
1068  */
1069 static HANDLER_DEF(int_handler)
1070 {
1071     init_handler( HANDLER_CONTEXT );
1072     if (!dispatch_signal(SIGINT))
1073     {
1074         EXCEPTION_RECORD rec;
1075         CONTEXT context;
1076
1077         save_context( &context, HANDLER_CONTEXT );
1078         rec.ExceptionCode    = CONTROL_C_EXIT;
1079         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1080         rec.ExceptionRecord  = NULL;
1081         rec.ExceptionAddress = (LPVOID)context.Eip;
1082         rec.NumberParameters = 0;
1083         EXC_RtlRaiseException( &rec, &context );
1084         restore_context( &context, HANDLER_CONTEXT );
1085     }
1086 }
1087
1088 /**********************************************************************
1089  *              abrt_handler
1090  *
1091  * Handler for SIGABRT.
1092  */
1093 static HANDLER_DEF(abrt_handler)
1094 {
1095     EXCEPTION_RECORD rec;
1096     CONTEXT context;
1097
1098     save_context( &context, HANDLER_CONTEXT );
1099     rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
1100     rec.ExceptionFlags   = EH_NONCONTINUABLE;
1101     rec.ExceptionRecord  = NULL;
1102     rec.ExceptionAddress = (LPVOID)context.Eip;
1103     rec.NumberParameters = 0;
1104     EXC_RtlRaiseException( &rec, &context ); /* Should never return.. */
1105     restore_context( &context, HANDLER_CONTEXT );
1106 }
1107
1108
1109 /**********************************************************************
1110  *              term_handler
1111  *
1112  * Handler for SIGTERM.
1113  */
1114 static HANDLER_DEF(term_handler)
1115 {
1116     init_handler( HANDLER_CONTEXT );
1117     SYSDEPS_AbortThread(0);
1118 }
1119
1120
1121 /**********************************************************************
1122  *              usr1_handler
1123  *
1124  * Handler for SIGUSR1, used to signal a thread that it got suspended.
1125  */
1126 static HANDLER_DEF(usr1_handler)
1127 {
1128     LARGE_INTEGER timeout;
1129
1130     init_handler( HANDLER_CONTEXT );
1131     /* wait with 0 timeout, will only return once the thread is no longer suspended */
1132     timeout.QuadPart = 0;
1133     NtWaitForMultipleObjects( 0, NULL, FALSE, FALSE, &timeout );
1134 }
1135
1136
1137 /***********************************************************************
1138  *           set_handler
1139  *
1140  * Set a signal handler
1141  */
1142 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1143 {
1144     struct sigaction sig_act;
1145
1146 #ifdef linux
1147     if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
1148     {
1149         struct kernel_sigaction sig_act;
1150         sig_act.ksa_handler = func;
1151         sig_act.ksa_flags   = SA_RESTART;
1152         sig_act.ksa_mask    = (1 << (SIGINT-1)) |
1153                               (1 << (SIGUSR2-1)) |
1154                               (1 << (SIGALRM-1));
1155         /* point to the top of the stack */
1156         sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
1157         return wine_sigaction( sig, &sig_act, NULL );
1158     }
1159 #endif  /* linux */
1160     sig_act.sa_handler = func;
1161     sigemptyset( &sig_act.sa_mask );
1162     sigaddset( &sig_act.sa_mask, SIGINT );
1163     sigaddset( &sig_act.sa_mask, SIGUSR2 );
1164     sigaddset( &sig_act.sa_mask, SIGALRM );
1165
1166 #ifdef linux
1167     sig_act.sa_flags = SA_RESTART;
1168 #elif defined (__svr4__) || defined(_SCO_DS)
1169     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1170 #else
1171     sig_act.sa_flags = 0;
1172 #endif
1173
1174 #ifdef SA_ONSTACK
1175     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1176 #endif
1177     return sigaction( sig, &sig_act, NULL );
1178 }
1179
1180
1181 /***********************************************************************
1182  *           __wine_set_signal_handler   (NTDLL.@)
1183  */
1184 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1185 {
1186     if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1187     if (handlers[sig] != NULL) return -2;
1188     handlers[sig] = wsh;
1189     return 0;
1190 }
1191
1192
1193 /**********************************************************************
1194  *              SIGNAL_Init
1195  */
1196 BOOL SIGNAL_Init(void)
1197 {
1198     int have_sigaltstack = 0;
1199
1200 #ifdef HAVE_SIGALTSTACK
1201     struct sigaltstack ss;
1202     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1203     {
1204         ss.ss_size  = SIGNAL_STACK_SIZE;
1205         ss.ss_flags = 0;
1206         if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1207 #ifdef linux
1208         /* sigaltstack may fail because the kernel is too old, or
1209            because glibc is brain-dead. In the latter case a
1210            direct system call should succeed. */
1211         else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1212 #endif  /* linux */
1213     }
1214 #endif  /* HAVE_SIGALTSTACK */
1215
1216     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1217     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1218     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1219     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1220     if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1221     if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1222     if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1223 #ifdef SIGBUS
1224     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1225 #endif
1226 #ifdef SIGTRAP
1227     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1228 #endif
1229
1230 #ifdef __HAVE_VM86
1231     if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
1232     if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1233 #endif
1234
1235     return TRUE;
1236
1237  error:
1238     perror("sigaction");
1239     return FALSE;
1240 }
1241
1242
1243 /**********************************************************************
1244  *              SIGNAL_Block
1245  *
1246  * Block the async signals.
1247  */
1248 void SIGNAL_Block(void)
1249 {
1250     sigset_t block_set;
1251
1252     sigemptyset( &block_set );
1253     sigaddset( &block_set, SIGALRM );
1254     sigaddset( &block_set, SIGIO );
1255     sigaddset( &block_set, SIGHUP );
1256     sigaddset( &block_set, SIGUSR1 );
1257     sigaddset( &block_set, SIGUSR2 );
1258     sigprocmask( SIG_BLOCK, &block_set, NULL );
1259 }
1260
1261
1262 /***********************************************************************
1263  *           SIGNAL_Unblock
1264  *
1265  * Unblock signals. Called from EXC_RtlRaiseException.
1266  */
1267 void SIGNAL_Unblock(void)
1268 {
1269     sigset_t all_sigs;
1270
1271     sigfillset( &all_sigs );
1272     sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
1273 }
1274
1275
1276 /**********************************************************************
1277  *              SIGNAL_Reset
1278  *
1279  * Restore the default handlers.
1280  */
1281 void SIGNAL_Reset(void)
1282 {
1283     signal( SIGINT, SIG_DFL );
1284     signal( SIGFPE, SIG_DFL );
1285     signal( SIGSEGV, SIG_DFL );
1286     signal( SIGILL, SIG_DFL );
1287     signal( SIGABRT, SIG_DFL );
1288     signal( SIGTERM, SIG_DFL );
1289 #ifdef SIGBUS
1290     signal( SIGBUS, SIG_DFL );
1291 #endif
1292 #ifdef SIGTRAP
1293     signal( SIGTRAP, SIG_DFL );
1294 #endif
1295 }
1296
1297
1298 #ifdef __HAVE_VM86
1299 /**********************************************************************
1300  *              __wine_enter_vm86   (NTDLL.@)
1301  *
1302  * Enter vm86 mode with the specified register context.
1303  */
1304 void __wine_enter_vm86( CONTEXT *context )
1305 {
1306     EXCEPTION_RECORD rec;
1307     TEB *teb = NtCurrentTeb();
1308     int res;
1309     struct vm86plus_struct vm86;
1310
1311     memset( &vm86, 0, sizeof(vm86) );
1312     for (;;)
1313     {
1314         restore_vm86_context( context, &vm86 );
1315         /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1316          * so save it on entry, just in case */
1317         teb->vm86_pending |= (context->EFlags & VIP_MASK);
1318         /* Work around race conditions with signal handler
1319          * (avoiding sigprocmask for performance reasons) */
1320         teb->vm86_ptr = &vm86;
1321         vm86.regs.eflags |= teb->vm86_pending;
1322         /* Check for VIF|VIP here, since vm86_enter doesn't */
1323         if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1324             teb->vm86_ptr = NULL;
1325             teb->vm86_pending = 0;
1326             context->EFlags |= VIP_MASK;
1327             rec.ExceptionCode = EXCEPTION_VM86_STI;
1328             rec.ExceptionInformation[0] = 0;
1329             goto cancel_vm86;
1330         }
1331
1332         do
1333         {
1334             res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1335             if (res < 0)
1336             {
1337                 errno = -res;
1338                 return;
1339             }
1340         } while (VM86_TYPE(res) == VM86_SIGNAL);
1341
1342         save_vm86_context( context, &vm86 );
1343         context->EFlags |= teb->vm86_pending;
1344
1345         switch(VM86_TYPE(res))
1346         {
1347         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1348             do_segv( context, T_PROTFLT, 0, 0 );
1349             continue;
1350         case VM86_TRAP: /* return due to DOS-debugger request */
1351             do_trap( context, VM86_ARG(res) );
1352             continue;
1353         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1354             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1355             break;
1356         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1357             teb->vm86_pending = 0;
1358             rec.ExceptionCode = EXCEPTION_VM86_STI;
1359             break;
1360         case VM86_PICRETURN: /* return due to pending PIC request */
1361             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1362             break;
1363         default:
1364             ERR( "unhandled result from vm86 mode %x\n", res );
1365             continue;
1366         }
1367         rec.ExceptionInformation[0] = VM86_ARG(res);
1368 cancel_vm86:
1369         rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
1370         rec.ExceptionRecord         = NULL;
1371         rec.ExceptionAddress        = (LPVOID)context->Eip;
1372         rec.NumberParameters        = 1;
1373         EXC_RtlRaiseException( &rec, context );
1374     }
1375 }
1376
1377 #else /* __HAVE_VM86 */
1378 /**********************************************************************
1379  *              __wine_enter_vm86   (NTDLL.@)
1380  */
1381 void __wine_enter_vm86( CONTEXT *context )
1382 {
1383     MESSAGE("vm86 mode not supported on this platform\n");
1384 }
1385 #endif /* __HAVE_VM86 */
1386
1387 /**********************************************************************
1388  *              DbgBreakPoint   (NTDLL.@)
1389  */
1390 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1391
1392 /**********************************************************************
1393  *              DbgUserBreakPoint   (NTDLL.@)
1394  */
1395 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1396
1397 #endif  /* __i386__ */