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 SS_sig(context)      ((context)->sc_ss)
 309
 310 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
 311  * saved by the exception handling. duh.
 312  * Actually they are in -current (have been for a while), and that
 313  * patch now finally has been MFC'd to -stable too (Nov 15 1999).
 314  * If you're running a system from the -stable branch older than that,
 315  * like a 3.3-RELEASE, grab the patch from the ports tree:
 316  * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
 317  * (If its not yet there when you look, go here:
 318  * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
 319  */
 320 #ifdef __FreeBSD__
 321 #define FS_sig(context)      ((context)->sc_fs)
 322 #define GS_sig(context)      ((context)->sc_gs)
 323 #endif
 324
 325 #ifdef linux
 326 #define FS_sig(context)      ((context)->sc_fs)
 327 #define GS_sig(context)      ((context)->sc_gs)
 328 #define CR2_sig(context)     ((context)->cr2)
 329 #define TRAP_sig(context)    ((context)->sc_trapno)
 330 #define ERROR_sig(context)   ((context)->sc_err)
 331 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 332 #endif
 333
 334 #ifndef __FreeBSD__
 335 #define EFL_sig(context)     ((context)->sc_eflags)
 336 #else
 337 #define EFL_sig(context)     ((context)->sc_efl)
 338 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 339 #define CR2_sig(context)     ((context)->sc_err)
 340 #define TRAP_sig(context)    ((context)->sc_trapno)
 341 #endif
 342
 343 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 344 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 345
 346 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 347
 348 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 349
 350 #ifdef _SCO_DS
 351 #define gregs regs
 352 #endif
 353
 354 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 355 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 356 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 357 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 358 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 359 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 360 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 361
 362 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 363 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 364 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 365 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 366
 367 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 368 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 369
 370 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 371
 372 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 373 #ifdef R_ESP
 374 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 375 #else
 376 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 377 #endif
 378 #ifdef TRAPNO
 379 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 380 #endif
 381
 382 #endif  /* svr4 || SCO_DS */
 383
 384
 385 /* exception code definitions (already defined by FreeBSD/NetBSD) */
 386 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
 387 #define T_DIVIDE        0   /* Division by zero exception */
 388 #define T_TRCTRAP       1   /* Single-step exception */
 389 #define T_NMI           2   /* NMI interrupt */
 390 #define T_BPTFLT        3   /* Breakpoint exception */
 391 #define T_OFLOW         4   /* Overflow exception */
 392 #define T_BOUND         5   /* Bound range exception */
 393 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 394 #define T_DNA           7   /* Device not available exception */
 395 #define T_DOUBLEFLT     8   /* Double fault exception */
 396 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 397 #define T_TSSFLT        10  /* Invalid TSS exception */
 398 #define T_SEGNPFLT      11  /* Segment not present exception */
 399 #define T_STKFLT        12  /* Stack fault */
 400 #define T_PROTFLT       13  /* General protection fault */
 401 #define T_PAGEFLT       14  /* Page fault */
 402 #define T_RESERVED      15  /* Unknown exception */
 403 #define T_ARITHTRAP     16  /* Floating point exception */
 404 #define T_ALIGNFLT      17  /* Alignment check exception */
 405 #define T_MCHK          18  /* Machine check exception */
 406 #define T_CACHEFLT      19  /* Cache flush exception */
 407 #endif
 408 #if defined(__NetBSD__)
 409 #define T_MCHK          19  /* Machine check exception */
 410 #endif
 411
 412 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 413
 414 #include "wine/exception.h"
 415 #include "stackframe.h"
 416 #include "global.h"
 417 #include "miscemu.h"
 418 #include "syslevel.h"
 419 #include "wine/debug.h"
 420
 421 WINE_DEFAULT_DEBUG_CHANNEL(seh);
 422
 423 typedef int (*wine_signal_handler)(unsigned int sig);
 424
 425 static wine_signal_handler handlers[256];
 426
 427 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
 428
 429 /***********************************************************************
 430  *           dispatch_signal
 431  */
 432 inline static int dispatch_signal(unsigned int sig)
 433 {
 434     if (handlers[sig] == NULL) return 0;
 435     return handlers[sig](sig);
 436 }
 437
 438
 439 /***********************************************************************
 440  *           get_trap_code
 441  *
 442  * Get the trap code for a signal.
 443  */
 444 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 445 {
 446 #ifdef TRAP_sig
 447     return TRAP_sig(sigcontext);
 448 #else
 449     return T_UNKNOWN;  /* unknown trap code */
 450 #endif
 451 }
 452
 453 /***********************************************************************
 454  *           get_error_code
 455  *
 456  * Get the error code for a signal.
 457  */
 458 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 459 {
 460 #ifdef ERROR_sig
 461     return ERROR_sig(sigcontext);
 462 #else
 463     return 0;
 464 #endif
 465 }
 466
 467 /***********************************************************************
 468  *           get_cr2_value
 469  *
 470  * Get the CR2 value for a signal.
 471  */
 472 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
 473 {
 474 #ifdef CR2_sig
 475     return (void *)CR2_sig(sigcontext);
 476 #else
 477     return NULL;
 478 #endif
 479 }
 480
 481
 482 #ifdef __HAVE_VM86
 483 /***********************************************************************
 484  *           save_vm86_context
 485  *
 486  * Set the register values from a vm86 structure.
 487  */
 488 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 489 {
 490     context->Eax    = vm86->regs.eax;
 491     context->Ebx    = vm86->regs.ebx;
 492     context->Ecx    = vm86->regs.ecx;
 493     context->Edx    = vm86->regs.edx;
 494     context->Esi    = vm86->regs.esi;
 495     context->Edi    = vm86->regs.edi;
 496     context->Esp    = vm86->regs.esp;
 497     context->Ebp    = vm86->regs.ebp;
 498     context->Eip    = vm86->regs.eip;
 499     context->SegCs  = vm86->regs.cs;
 500     context->SegDs  = vm86->regs.ds;
 501     context->SegEs  = vm86->regs.es;
 502     context->SegFs  = vm86->regs.fs;
 503     context->SegGs  = vm86->regs.gs;
 504     context->SegSs  = vm86->regs.ss;
 505     context->EFlags = vm86->regs.eflags;
 506 }
 507
 508
 509 /***********************************************************************
 510  *           restore_vm86_context
 511  *
 512  * Build a vm86 structure from the register values.
 513  */
 514 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 515 {
 516     vm86->regs.eax    = context->Eax;
 517     vm86->regs.ebx    = context->Ebx;
 518     vm86->regs.ecx    = context->Ecx;
 519     vm86->regs.edx    = context->Edx;
 520     vm86->regs.esi    = context->Esi;
 521     vm86->regs.edi    = context->Edi;
 522     vm86->regs.esp    = context->Esp;
 523     vm86->regs.ebp    = context->Ebp;
 524     vm86->regs.eip    = context->Eip;
 525     vm86->regs.cs     = context->SegCs;
 526     vm86->regs.ds     = context->SegDs;
 527     vm86->regs.es     = context->SegEs;
 528     vm86->regs.fs     = context->SegFs;
 529     vm86->regs.gs     = context->SegGs;
 530     vm86->regs.ss     = context->SegSs;
 531     vm86->regs.eflags = context->EFlags;
 532 }
 533 #endif /* __HAVE_VM86 */
 534
 535
 536 /***********************************************************************
 537  *           save_context
 538  *
 539  * Set the register values from a sigcontext.
 540  */
 541 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 542 {
 543     /* get %fs and %gs at time of the fault */
 544 #ifdef FS_sig
 545     context->SegFs = LOWORD(FS_sig(sigcontext));
 546 #else
 547     context->SegFs = wine_get_fs();
 548 #endif
 549 #ifdef GS_sig
 550     context->SegGs = LOWORD(GS_sig(sigcontext));
 551 #else
 552     context->SegGs = wine_get_gs();
 553 #endif
 554
 555     /* now restore a proper %fs for the fault handler */
 556     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
 557         !IS_SELECTOR_SYSTEM(SS_sig(sigcontext)))  /* 16-bit mode */
 558     {
 559         /*
 560          * Win16 or DOS protected mode. Note that during switch
 561          * from 16-bit mode to linear mode, CS may be set to system
 562          * segment before FS is restored. Fortunately, in this case
 563          * SS is still non-system segment. This is why both CS and SS
 564          * are checked.
 565          */
 566         wine_set_fs( SYSLEVEL_Win16CurrentTeb );
 567         wine_set_gs( NtCurrentTeb()->gs_sel );
 568     }
 569 #ifdef __HAVE_VM86
 570     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 571     {
 572         unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
 573
 574         /* fetch the saved %fs on the stack */
 575         wine_set_fs( stack[0] );
 576         wine_set_gs( stack[1] );
 577         if (EAX_sig(sigcontext) == VM86_EAX) {
 578             /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 579              * (but we could also get if from teb->vm86_ptr) */
 580             struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
 581             /* get context from vm86 struct */
 582             save_vm86_context( context, vm86 );
 583             return;
 584         }
 585     }
 586 #endif  /* __HAVE_VM86 */
 587     else  /* 32-bit mode */
 588     {
 589 #ifdef FS_sig
 590         wine_set_fs( FS_sig(sigcontext) );
 591 #endif
 592 #ifdef GS_sig
 593         wine_set_gs( GS_sig(sigcontext) );
 594 #endif
 595     }
 596
 597     context->Eax    = EAX_sig(sigcontext);
 598     context->Ebx    = EBX_sig(sigcontext);
 599     context->Ecx    = ECX_sig(sigcontext);
 600     context->Edx    = EDX_sig(sigcontext);
 601     context->Esi    = ESI_sig(sigcontext);
 602     context->Edi    = EDI_sig(sigcontext);
 603     context->Ebp    = EBP_sig(sigcontext);
 604     context->EFlags = EFL_sig(sigcontext);
 605     context->Eip    = EIP_sig(sigcontext);
 606     context->Esp    = ESP_sig(sigcontext);
 607     context->SegCs  = LOWORD(CS_sig(sigcontext));
 608     context->SegDs  = LOWORD(DS_sig(sigcontext));
 609     context->SegEs  = LOWORD(ES_sig(sigcontext));
 610     context->SegSs  = LOWORD(SS_sig(sigcontext));
 611 }
 612
 613
 614 /***********************************************************************
 615  *           restore_context
 616  *
 617  * Build a sigcontext from the register values.
 618  */
 619 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 620 {
 621 #ifdef __HAVE_VM86
 622     /* check if exception occurred in vm86 mode */
 623     if ((void *)EIP_sig(sigcontext) == vm86_return &&
 624         IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
 625         EAX_sig(sigcontext) == VM86_EAX)
 626     {
 627         unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
 628         /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 629          * (but we could also get it from teb->vm86_ptr) */
 630         struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
 631         restore_vm86_context( context, vm86 );
 632         return;
 633     }
 634 #endif /* __HAVE_VM86 */
 635
 636     EAX_sig(sigcontext) = context->Eax;
 637     EBX_sig(sigcontext) = context->Ebx;
 638     ECX_sig(sigcontext) = context->Ecx;
 639     EDX_sig(sigcontext) = context->Edx;
 640     ESI_sig(sigcontext) = context->Esi;
 641     EDI_sig(sigcontext) = context->Edi;
 642     EBP_sig(sigcontext) = context->Ebp;
 643     EFL_sig(sigcontext) = context->EFlags;
 644     EIP_sig(sigcontext) = context->Eip;
 645     ESP_sig(sigcontext) = context->Esp;
 646     CS_sig(sigcontext)  = context->SegCs;
 647     DS_sig(sigcontext)  = context->SegDs;
 648     ES_sig(sigcontext)  = context->SegEs;
 649     SS_sig(sigcontext)  = context->SegSs;
 650 #ifdef FS_sig
 651     FS_sig(sigcontext)  = context->SegFs;
 652 #else
 653     wine_set_fs( context->SegFs );
 654 #endif
 655 #ifdef GS_sig
 656     GS_sig(sigcontext)  = context->SegGs;
 657 #else
 658     wine_set_gs( context->SegGs );
 659 #endif
 660 }
 661
 662
 663 /***********************************************************************
 664  *           init_handler
 665  *
 666  * Handler initialization when the full context is not needed.
 667  */
 668 static void init_handler( const SIGCONTEXT *sigcontext )
 669 {
 670     /* restore a proper %fs for the fault handler */
 671     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
 672         !IS_SELECTOR_SYSTEM(SS_sig(sigcontext)))  /* 16-bit mode */
 673     {
 674         wine_set_fs( SYSLEVEL_Win16CurrentTeb );
 675         wine_set_gs( NtCurrentTeb()->gs_sel );
 676     }
 677 #ifdef __HAVE_VM86
 678     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 679     {
 680         /* fetch the saved %fs on the stack */
 681         wine_set_fs( *(unsigned int *)ESP_sig(sigcontext) );
 682         wine_set_gs( NtCurrentTeb()->gs_sel );
 683     }
 684 #endif  /* __HAVE_VM86 */
 685     else  /* 32-bit mode, get %fs at time of the fault */
 686     {
 687 #ifdef FS_sig
 688         wine_set_fs( FS_sig(sigcontext) );
 689 #endif
 690 #ifdef GS_sig
 691         wine_set_gs( GS_sig(sigcontext) );
 692 #endif
 693     }
 694 }
 695
 696
 697 /***********************************************************************
 698  *           save_fpu
 699  *
 700  * Set the FPU context from a sigcontext.
 701  */
 702 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 703 {
 704 #ifdef FPU_sig
 705     if (FPU_sig(sigcontext))
 706     {
 707         context->FloatSave = *FPU_sig(sigcontext);
 708         return;
 709     }
 710 #endif  /* FPU_sig */
 711 #ifdef __GNUC__
 712     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 713 #endif  /* __GNUC__ */
 714 }
 715
 716
 717 /***********************************************************************
 718  *           restore_fpu
 719  *
 720  * Restore the FPU context to a sigcontext.
 721  */
 722 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 723 {
 724     /* reset the current interrupt status */
 725     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 726 #ifdef FPU_sig
 727     if (FPU_sig(sigcontext))
 728     {
 729         *FPU_sig(sigcontext) = context->FloatSave;
 730         return;
 731     }
 732 #endif  /* FPU_sig */
 733 #ifdef __GNUC__
 734     /* avoid nested exceptions */
 735     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 736 #endif  /* __GNUC__ */
 737 }
 738
 739
 740 /**********************************************************************
 741  *              get_fpu_code
 742  *
 743  * Get the FPU exception code from the FPU status.
 744  */
 745 static inline DWORD get_fpu_code( const CONTEXT *context )
 746 {
 747     DWORD status = context->FloatSave.StatusWord;
 748
 749     if (status & 0x01)  /* IE */
 750     {
 751         if (status & 0x40)  /* SF */
 752             return EXCEPTION_FLT_STACK_CHECK;
 753         else
 754             return EXCEPTION_FLT_INVALID_OPERATION;
 755     }
 756     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 757     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 758     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 759     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 760     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 761     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 762 }
 763
 764
 765 /**********************************************************************
 766  *              do_segv
 767  *
 768  * Implementation of SIGSEGV handler.
 769  */
 770 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
 771 {
 772     EXCEPTION_RECORD rec;
 773     DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
 774
 775 #ifdef CR2_sig
 776     /* we want the page-fault case to be fast */
 777     if (trap_code == T_PAGEFLT)
 778         if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
 779 #endif
 780
 781     rec.ExceptionRecord  = NULL;
 782     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 783     rec.ExceptionAddress = (LPVOID)context->Eip;
 784     rec.NumberParameters = 0;
 785
 786     switch(trap_code)
 787     {
 788     case T_OFLOW:   /* Overflow exception */
 789         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 790         break;
 791     case T_BOUND:   /* Bound range exception */
 792         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 793         break;
 794     case T_PRIVINFLT:   /* Invalid opcode exception */
 795         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 796         break;
 797     case T_STKFLT:  /* Stack fault */
 798         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 799         break;
 800     case T_SEGNPFLT:  /* Segment not present exception */
 801     case T_PROTFLT:   /* General protection fault */
 802     case T_UNKNOWN:   /* Unknown fault code */
 803         if (INSTR_EmulateInstruction( context )) return;
 804         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 805         break;
 806     case T_PAGEFLT:  /* Page fault */
 807 #ifdef CR2_sig
 808         rec.NumberParameters = 2;
 809         rec.ExceptionInformation[0] = (err_code & 2) != 0;
 810         rec.ExceptionInformation[1] = (DWORD)cr2;
 811 #endif /* CR2_sig */
 812         rec.ExceptionCode = page_fault_code;
 813         break;
 814     case T_ALIGNFLT:  /* Alignment check exception */
 815         /* FIXME: pass through exception handler first? */
 816         if (context->EFlags & 0x00040000)
 817         {
 818             /* Disable AC flag, return */
 819             context->EFlags &= ~0x00040000;
 820             return;
 821         }
 822         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 823         break;
 824     default:
 825         ERR( "Got unexpected trap %d\n", trap_code );
 826         /* fall through */
 827     case T_NMI:       /* NMI interrupt */
 828     case T_DNA:       /* Device not available exception */
 829     case T_DOUBLEFLT: /* Double fault exception */
 830     case T_TSSFLT:    /* Invalid TSS exception */
 831     case T_RESERVED:  /* Unknown exception */
 832     case T_MCHK:      /* Machine check exception */
 833 #ifdef T_CACHEFLT
 834     case T_CACHEFLT:  /* Cache flush exception */
 835 #endif
 836         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 837         break;
 838     }
 839     EXC_RtlRaiseException( &rec, context );
 840 }
 841
 842
 843 /**********************************************************************
 844  *              do_trap
 845  *
 846  * Implementation of SIGTRAP handler.
 847  */
 848 static void do_trap( CONTEXT *context, int trap_code )
 849 {
 850     EXCEPTION_RECORD rec;
 851     DWORD dr0, dr1, dr2, dr3, dr6, dr7;
 852
 853     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 854     rec.ExceptionRecord  = NULL;
 855     rec.ExceptionAddress = (LPVOID)context->Eip;
 856     rec.NumberParameters = 0;
 857
 858     switch(trap_code)
 859     {
 860     case T_TRCTRAP:  /* Single-step exception */
 861         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 862         if (context->EFlags & 0x100)
 863         {
 864             context->EFlags &= ~0x100;  /* clear single-step flag */
 865         }
 866         else  /* hardware breakpoint, fetch the debug registers */
 867         {
 868             context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
 869             GetThreadContext(GetCurrentThread(), context);
 870         }
 871         break;
 872     case T_BPTFLT:   /* Breakpoint exception */
 873         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 874         /* fall through */
 875     default:
 876         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 877         break;
 878     }
 879     dr0 = context->Dr0;
 880     dr1 = context->Dr1;
 881     dr2 = context->Dr2;
 882     dr3 = context->Dr3;
 883     dr6 = context->Dr6;
 884     dr7 = context->Dr7;
 885
 886     EXC_RtlRaiseException( &rec, context );
 887
 888     if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
 889         dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
 890     {
 891         /* the debug registers have changed, set the new values */
 892         context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
 893         SetThreadContext(GetCurrentThread(), context);
 894     }
 895 }
 896
 897
 898 /**********************************************************************
 899  *              do_fpe
 900  *
 901  * Implementation of SIGFPE handler
 902  */
 903 static void do_fpe( CONTEXT *context, int trap_code )
 904 {
 905     EXCEPTION_RECORD rec;
 906
 907     switch(trap_code)
 908     {
 909     case T_DIVIDE:   /* Division by zero exception */
 910         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 911         break;
 912     case T_FPOPFLT:   /* Coprocessor segment overrun */
 913         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 914         break;
 915     case T_ARITHTRAP:  /* Floating point exception */
 916     case T_UNKNOWN:    /* Unknown fault code */
 917         rec.ExceptionCode = get_fpu_code( context );
 918         break;
 919     default:
 920         ERR( "Got unexpected trap %d\n", trap_code );
 921         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 922         break;
 923     }
 924     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 925     rec.ExceptionRecord  = NULL;
 926     rec.ExceptionAddress = (LPVOID)context->Eip;
 927     rec.NumberParameters = 0;
 928     EXC_RtlRaiseException( &rec, context );
 929 }
 930
 931
 932 #ifdef __HAVE_VM86
 933 /**********************************************************************
 934  *              set_vm86_pend
 935  *
 936  * Handler for SIGUSR2, which we use to set the vm86 pending flag.
 937  */
 938 static void set_vm86_pend( CONTEXT *context )
 939 {
 940     EXCEPTION_RECORD rec;
 941     TEB *teb = NtCurrentTeb();
 942     struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
 943
 944     rec.ExceptionCode           = EXCEPTION_VM86_STI;
 945     rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
 946     rec.ExceptionRecord         = NULL;
 947     rec.NumberParameters        = 1;
 948     rec.ExceptionInformation[0] = 0;
 949
 950     /* __wine_enter_vm86() merges the vm86_pending flag in safely */
 951     teb->vm86_pending |= VIP_MASK;
 952     /* see if we were in VM86 mode */
 953     if (context->EFlags & 0x00020000)
 954     {
 955         /* seems so, also set flag in signal context */
 956         if (context->EFlags & VIP_MASK) return;
 957         context->EFlags |= VIP_MASK;
 958         vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
 959         if (context->EFlags & VIF_MASK) {
 960             /* VIF is set, throw exception */
 961             teb->vm86_pending = 0;
 962             teb->vm86_ptr = NULL;
 963             rec.ExceptionAddress = (LPVOID)context->Eip;
 964             EXC_RtlRaiseException( &rec, context );
 965             teb->vm86_ptr = vm86;
 966         }
 967     }
 968     else if (vm86)
 969     {
 970         /* not in VM86, but possibly setting up for it */
 971         if (vm86->regs.eflags & VIP_MASK) return;
 972         vm86->regs.eflags |= VIP_MASK;
 973         if (((char*)context->Eip >= (char*)vm86_return) &&
 974             ((char*)context->Eip <= (char*)vm86_return_end) &&
 975             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
 976             /* exiting from VM86, can't throw */
 977             return;
 978         }
 979         if (vm86->regs.eflags & VIF_MASK) {
 980             /* VIF is set, throw exception */
 981             CONTEXT vcontext;
 982             teb->vm86_pending = 0;
 983             teb->vm86_ptr = NULL;
 984             save_vm86_context( &vcontext, vm86 );
 985             rec.ExceptionAddress = (LPVOID)vcontext.Eip;
 986             EXC_RtlRaiseException( &rec, &vcontext );
 987             teb->vm86_ptr = vm86;
 988             restore_vm86_context( &vcontext, vm86 );
 989         }
 990     }
 991 }
 992
 993
 994 /**********************************************************************
 995  *              usr2_handler
 996  *
 997  * Handler for SIGUSR2.
 998  * We use it to signal that the running __wine_enter_vm86() should
 999  * immediately set VIP_MASK, causing pending events to be handled
1000  * as early as possible.
1001  */
1002 static HANDLER_DEF(usr2_handler)
1003 {
1004     CONTEXT context;
1005
1006     save_context( &context, HANDLER_CONTEXT );
1007     set_vm86_pend( &context );
1008     restore_context( &context, HANDLER_CONTEXT );
1009 }
1010
1011
1012 /**********************************************************************
1013  *              alrm_handler
1014  *
1015  * Handler for SIGALRM.
1016  * Increases the alarm counter and sets the vm86 pending flag.
1017  */
1018 static HANDLER_DEF(alrm_handler)
1019 {
1020     CONTEXT context;
1021
1022     save_context( &context, HANDLER_CONTEXT );
1023     NtCurrentTeb()->alarms++;
1024     set_vm86_pend( &context );
1025     restore_context( &context, HANDLER_CONTEXT );
1026 }
1027 #endif /* __HAVE_VM86 */
1028
1029
1030 /**********************************************************************
1031  *              segv_handler
1032  *
1033  * Handler for SIGSEGV and related errors.
1034  */
1035 static HANDLER_DEF(segv_handler)
1036 {
1037     CONTEXT context;
1038     save_context( &context, HANDLER_CONTEXT );
1039     do_segv( &context, get_trap_code(HANDLER_CONTEXT),
1040              get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
1041     restore_context( &context, HANDLER_CONTEXT );
1042 }
1043
1044
1045 /**********************************************************************
1046  *              trap_handler
1047  *
1048  * Handler for SIGTRAP.
1049  */
1050 static HANDLER_DEF(trap_handler)
1051 {
1052     CONTEXT context;
1053     save_context( &context, HANDLER_CONTEXT );
1054     do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
1055     restore_context( &context, HANDLER_CONTEXT );
1056 }
1057
1058
1059 /**********************************************************************
1060  *              fpe_handler
1061  *
1062  * Handler for SIGFPE.
1063  */
1064 static HANDLER_DEF(fpe_handler)
1065 {
1066     CONTEXT context;
1067     save_fpu( &context, HANDLER_CONTEXT );
1068     save_context( &context, HANDLER_CONTEXT );
1069     do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
1070     restore_context( &context, HANDLER_CONTEXT );
1071     restore_fpu( &context, HANDLER_CONTEXT );
1072 }
1073
1074
1075 /**********************************************************************
1076  *              int_handler
1077  *
1078  * Handler for SIGINT.
1079  */
1080 static HANDLER_DEF(int_handler)
1081 {
1082     init_handler( HANDLER_CONTEXT );
1083     if (!dispatch_signal(SIGINT))
1084     {
1085         EXCEPTION_RECORD rec;
1086         CONTEXT context;
1087
1088         save_context( &context, HANDLER_CONTEXT );
1089         rec.ExceptionCode    = CONTROL_C_EXIT;
1090         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1091         rec.ExceptionRecord  = NULL;
1092         rec.ExceptionAddress = (LPVOID)context.Eip;
1093         rec.NumberParameters = 0;
1094         EXC_RtlRaiseException( &rec, &context );
1095         restore_context( &context, HANDLER_CONTEXT );
1096     }
1097 }
1098
1099 /**********************************************************************
1100  *              abrt_handler
1101  *
1102  * Handler for SIGABRT.
1103  */
1104 static HANDLER_DEF(abrt_handler)
1105 {
1106     EXCEPTION_RECORD rec;
1107     CONTEXT context;
1108
1109     save_context( &context, HANDLER_CONTEXT );
1110     rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
1111     rec.ExceptionFlags   = EH_NONCONTINUABLE;
1112     rec.ExceptionRecord  = NULL;
1113     rec.ExceptionAddress = (LPVOID)context.Eip;
1114     rec.NumberParameters = 0;
1115     EXC_RtlRaiseException( &rec, &context ); /* Should never return.. */
1116     restore_context( &context, HANDLER_CONTEXT );
1117 }
1118
1119
1120 /**********************************************************************
1121  *              term_handler
1122  *
1123  * Handler for SIGTERM.
1124  */
1125 static HANDLER_DEF(term_handler)
1126 {
1127     init_handler( HANDLER_CONTEXT );
1128     SYSDEPS_AbortThread(0);
1129 }
1130
1131
1132 /**********************************************************************
1133  *              usr1_handler
1134  *
1135  * Handler for SIGUSR1, used to signal a thread that it got suspended.
1136  */
1137 static HANDLER_DEF(usr1_handler)
1138 {
1139     init_handler( HANDLER_CONTEXT );
1140     /* wait with 0 timeout, will only return once the thread is no longer suspended */
1141     WaitForMultipleObjectsEx( 0, NULL, FALSE, 0, FALSE );
1142 }
1143
1144
1145 /***********************************************************************
1146  *           set_handler
1147  *
1148  * Set a signal handler
1149  */
1150 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1151 {
1152     struct sigaction sig_act;
1153
1154 #ifdef linux
1155     if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
1156     {
1157         struct kernel_sigaction sig_act;
1158         sig_act.ksa_handler = func;
1159         sig_act.ksa_flags   = SA_RESTART;
1160         sig_act.ksa_mask    = (1 << (SIGINT-1)) |
1161                               (1 << (SIGUSR2-1)) |
1162                               (1 << (SIGALRM-1));
1163         /* point to the top of the stack */
1164         sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
1165         return wine_sigaction( sig, &sig_act, NULL );
1166     }
1167 #endif  /* linux */
1168     sig_act.sa_handler = func;
1169     sigemptyset( &sig_act.sa_mask );
1170     sigaddset( &sig_act.sa_mask, SIGINT );
1171     sigaddset( &sig_act.sa_mask, SIGUSR2 );
1172     sigaddset( &sig_act.sa_mask, SIGALRM );
1173
1174 #ifdef linux
1175     sig_act.sa_flags = SA_RESTART;
1176 #elif defined (__svr4__) || defined(_SCO_DS)
1177     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1178 #else
1179     sig_act.sa_flags = 0;
1180 #endif
1181
1182 #ifdef SA_ONSTACK
1183     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1184 #endif
1185     return sigaction( sig, &sig_act, NULL );
1186 }
1187
1188
1189 /***********************************************************************
1190  *           __wine_set_signal_handler   (NTDLL.@)
1191  */
1192 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1193 {
1194     if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1195     if (handlers[sig] != NULL) return -2;
1196     handlers[sig] = wsh;
1197     return 0;
1198 }
1199
1200
1201 /**********************************************************************
1202  *              SIGNAL_Init
1203  */
1204 BOOL SIGNAL_Init(void)
1205 {
1206     int have_sigaltstack = 0;
1207
1208 #ifdef HAVE_SIGALTSTACK
1209     struct sigaltstack ss;
1210     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1211     {
1212         ss.ss_size  = SIGNAL_STACK_SIZE;
1213         ss.ss_flags = 0;
1214         if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1215 #ifdef linux
1216         /* sigaltstack may fail because the kernel is too old, or
1217            because glibc is brain-dead. In the latter case a
1218            direct system call should succeed. */
1219         else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1220 #endif  /* linux */
1221     }
1222 #endif  /* HAVE_SIGALTSTACK */
1223
1224     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1225     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1226     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1227     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1228     if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1229     if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1230     if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1231 #ifdef SIGBUS
1232     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1233 #endif
1234 #ifdef SIGTRAP
1235     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1236 #endif
1237
1238 #ifdef __HAVE_VM86
1239     if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
1240     if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1241 #endif
1242
1243     return TRUE;
1244
1245  error:
1246     perror("sigaction");
1247     return FALSE;
1248 }
1249
1250
1251 /**********************************************************************
1252  *              SIGNAL_Block
1253  *
1254  * Block the async signals.
1255  */
1256 void SIGNAL_Block(void)
1257 {
1258     sigset_t block_set;
1259
1260     sigemptyset( &block_set );
1261     sigaddset( &block_set, SIGALRM );
1262     sigaddset( &block_set, SIGIO );
1263     sigaddset( &block_set, SIGHUP );
1264     sigaddset( &block_set, SIGUSR1 );
1265     sigaddset( &block_set, SIGUSR2 );
1266     sigprocmask( SIG_BLOCK, &block_set, NULL );
1267 }
1268
1269
1270 /***********************************************************************
1271  *           SIGNAL_Unblock
1272  *
1273  * Unblock signals. Called from EXC_RtlRaiseException.
1274  */
1275 void SIGNAL_Unblock(void)
1276 {
1277     sigset_t all_sigs;
1278
1279     sigfillset( &all_sigs );
1280     sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
1281 }
1282
1283
1284 /**********************************************************************
1285  *              SIGNAL_Reset
1286  *
1287  * Restore the default handlers.
1288  */
1289 void SIGNAL_Reset(void)
1290 {
1291     signal( SIGINT, SIG_DFL );
1292     signal( SIGFPE, SIG_DFL );
1293     signal( SIGSEGV, SIG_DFL );
1294     signal( SIGILL, SIG_DFL );
1295     signal( SIGABRT, SIG_DFL );
1296     signal( SIGTERM, SIG_DFL );
1297 #ifdef SIGBUS
1298     signal( SIGBUS, SIG_DFL );
1299 #endif
1300 #ifdef SIGTRAP
1301     signal( SIGTRAP, SIG_DFL );
1302 #endif
1303 }
1304
1305
1306 #ifdef __HAVE_VM86
1307 /**********************************************************************
1308  *              __wine_enter_vm86   (NTDLL.@)
1309  *
1310  * Enter vm86 mode with the specified register context.
1311  */
1312 void __wine_enter_vm86( CONTEXT *context )
1313 {
1314     EXCEPTION_RECORD rec;
1315     TEB *teb = NtCurrentTeb();
1316     int res;
1317     struct vm86plus_struct vm86;
1318
1319     memset( &vm86, 0, sizeof(vm86) );
1320     for (;;)
1321     {
1322         restore_vm86_context( context, &vm86 );
1323         /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1324          * so save it on entry, just in case */
1325         teb->vm86_pending |= (context->EFlags & VIP_MASK);
1326         /* Work around race conditions with signal handler
1327          * (avoiding sigprocmask for performance reasons) */
1328         teb->vm86_ptr = &vm86;
1329         vm86.regs.eflags |= teb->vm86_pending;
1330         /* Check for VIF|VIP here, since vm86_enter doesn't */
1331         if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1332             teb->vm86_ptr = NULL;
1333             teb->vm86_pending = 0;
1334             context->EFlags |= VIP_MASK;
1335             rec.ExceptionCode = EXCEPTION_VM86_STI;
1336             rec.ExceptionInformation[0] = 0;
1337             goto cancel_vm86;
1338         }
1339
1340         do
1341         {
1342             res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1343             if (res < 0)
1344             {
1345                 errno = -res;
1346                 return;
1347             }
1348         } while (VM86_TYPE(res) == VM86_SIGNAL);
1349
1350         save_vm86_context( context, &vm86 );
1351         context->EFlags |= teb->vm86_pending;
1352
1353         switch(VM86_TYPE(res))
1354         {
1355         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1356             do_segv( context, T_PROTFLT, 0, 0 );
1357             continue;
1358         case VM86_TRAP: /* return due to DOS-debugger request */
1359             do_trap( context, VM86_ARG(res) );
1360             continue;
1361         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1362             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1363             break;
1364         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1365             teb->vm86_pending = 0;
1366             rec.ExceptionCode = EXCEPTION_VM86_STI;
1367             break;
1368         case VM86_PICRETURN: /* return due to pending PIC request */
1369             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1370             break;
1371         default:
1372             ERR( "unhandled result from vm86 mode %x\n", res );
1373             continue;
1374         }
1375         rec.ExceptionInformation[0] = VM86_ARG(res);
1376 cancel_vm86:
1377         rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
1378         rec.ExceptionRecord         = NULL;
1379         rec.ExceptionAddress        = (LPVOID)context->Eip;
1380         rec.NumberParameters        = 1;
1381         EXC_RtlRaiseException( &rec, context );
1382     }
1383 }
1384
1385 #else /* __HAVE_VM86 */
1386 /**********************************************************************
1387  *              __wine_enter_vm86   (NTDLL.@)
1388  */
1389 void __wine_enter_vm86( CONTEXT *context )
1390 {
1391     MESSAGE("vm86 mode not supported on this platform\n");
1392 }
1393 #endif /* __HAVE_VM86 */
1394
1395 /**********************************************************************
1396  *              DbgBreakPoint   (NTDLL.@)
1397  */
1398 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1399
1400 /**********************************************************************
1401  *              DbgUserBreakPoint   (NTDLL.@)
1402  */
1403 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1404
1405 #endif  /* __i386__ */