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 <stdarg.h>
  30 #include <stdio.h>
  31 #ifdef HAVE_UNISTD_H
  32 # include <unistd.h>
  33 #endif
  34
  35 #ifdef HAVE_SYS_PARAM_H
  36 # include <sys/param.h>
  37 #endif
  38 #ifdef HAVE_SYSCALL_H
  39 # include <syscall.h>
  40 #else
  41 # ifdef HAVE_SYS_SYSCALL_H
  42 #  include <sys/syscall.h>
  43 # endif
  44 #endif
  45
  46 #ifdef HAVE_SYS_VM86_H
  47 # include <sys/vm86.h>
  48 #endif
  49
  50 #ifdef HAVE_SYS_SIGNAL_H
  51 # include <sys/signal.h>
  52 #endif
  53
  54 #include "windef.h"
  55 #include "winbase.h"
  56 #include "winreg.h"
  57 #include "winternl.h"
  58 #include "wine/library.h"
  59 #include "ntdll_misc.h"
  60
  61 /***********************************************************************
  62  * signal context platform-specific definitions
  63  */
  64
  65 #ifdef linux
  66 typedef struct
  67 {
  68     unsigned short sc_gs, __gsh;
  69     unsigned short sc_fs, __fsh;
  70     unsigned short sc_es, __esh;
  71     unsigned short sc_ds, __dsh;
  72     unsigned long sc_edi;
  73     unsigned long sc_esi;
  74     unsigned long sc_ebp;
  75     unsigned long sc_esp;
  76     unsigned long sc_ebx;
  77     unsigned long sc_edx;
  78     unsigned long sc_ecx;
  79     unsigned long sc_eax;
  80     unsigned long sc_trapno;
  81     unsigned long sc_err;
  82     unsigned long sc_eip;
  83     unsigned short sc_cs, __csh;
  84     unsigned long sc_eflags;
  85     unsigned long esp_at_signal;
  86     unsigned short sc_ss, __ssh;
  87     unsigned long i387;
  88     unsigned long oldmask;
  89     unsigned long cr2;
  90 } SIGCONTEXT;
  91
  92 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
  93 #define HANDLER_CONTEXT (&__context)
  94
  95 /* this is the sigaction structure from the Linux 2.1.20 kernel.  */
  96 struct kernel_sigaction
  97 {
  98     void (*ksa_handler)();
  99     unsigned long ksa_mask;
 100     unsigned long ksa_flags;
 101     void *ksa_restorer;
 102 };
 103
 104 /* Similar to the sigaction function in libc, except it leaves alone the
 105    restorer field, which is used to specify the signal stack address */
 106 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
 107                                   struct kernel_sigaction *old )
 108 {
 109     __asm__ __volatile__( "pushl %%ebx\n\t"
 110                           "movl %2,%%ebx\n\t"
 111                           "int $0x80\n\t"
 112                           "popl %%ebx"
 113                           : "=a" (sig)
 114                           : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
 115     if (sig>=0) return 0;
 116     errno = -sig;
 117     return -1;
 118 }
 119
 120 #ifdef HAVE_SIGALTSTACK
 121 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
 122 static inline int wine_sigaltstack( const struct sigaltstack *new,
 123                                     struct sigaltstack *old )
 124 {
 125     int ret;
 126     __asm__ __volatile__( "pushl %%ebx\n\t"
 127                           "movl %2,%%ebx\n\t"
 128                           "int $0x80\n\t"
 129                           "popl %%ebx"
 130                           : "=a" (ret)
 131                           : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
 132     if (ret >= 0) return 0;
 133     errno = -ret;
 134     return -1;
 135 }
 136 #endif
 137
 138 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
 139
 140 int vm86_enter( void **vm86_ptr );
 141 void vm86_return(void);
 142 void vm86_return_end(void);
 143 __ASM_GLOBAL_FUNC(vm86_enter,
 144                   "pushl %ebp\n\t"
 145                   "movl %esp, %ebp\n\t"
 146                   "movl $166,%eax\n\t"  /*SYS_vm86*/
 147                   "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
 148                   "movl (%ecx),%ecx\n\t"
 149                   "pushl %ebx\n\t"
 150                   "movl $1,%ebx\n\t"    /*VM86_ENTER*/
 151                   "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
 152                   "pushl %fs\n\t"
 153                   "pushl %gs\n\t"
 154                   "int $0x80\n"
 155                   ".globl " __ASM_NAME("vm86_return") "\n\t"
 156                   __ASM_FUNC("vm86_return") "\n"
 157                   __ASM_NAME("vm86_return") ":\n\t"
 158                   "popl %gs\n\t"
 159                   "popl %fs\n\t"
 160                   "popl %ecx\n\t"
 161                   "popl %ebx\n\t"
 162                   "popl %ebp\n\t"
 163                   "testl %eax,%eax\n\t"
 164                   "jl 0f\n\t"
 165                   "cmpb $0,%al\n\t" /* VM86_SIGNAL */
 166                   "je " __ASM_NAME("vm86_enter") "\n\t"
 167                   "0:\n\t"
 168                   "movl 4(%esp),%ecx\n\t"  /* vm86_ptr */
 169                   "movl $0,(%ecx)\n\t"
 170                   ".globl " __ASM_NAME("vm86_return_end") "\n\t"
 171                   __ASM_FUNC("vm86_return_end") "\n"
 172                   __ASM_NAME("vm86_return_end") ":\n\t"
 173                   "ret" );
 174
 175 #ifdef HAVE_SYS_VM86_H
 176 # define __HAVE_VM86
 177 #endif
 178
 179 #endif  /* linux */
 180
 181 #ifdef BSDI
 182
 183 #define EAX_sig(context)     ((context)->tf_eax)
 184 #define EBX_sig(context)     ((context)->tf_ebx)
 185 #define ECX_sig(context)     ((context)->tf_ecx)
 186 #define EDX_sig(context)     ((context)->tf_edx)
 187 #define ESI_sig(context)     ((context)->tf_esi)
 188 #define EDI_sig(context)     ((context)->tf_edi)
 189 #define EBP_sig(context)     ((context)->tf_ebp)
 190
 191 #define CS_sig(context)      ((context)->tf_cs)
 192 #define DS_sig(context)      ((context)->tf_ds)
 193 #define ES_sig(context)      ((context)->tf_es)
 194 #define SS_sig(context)      ((context)->tf_ss)
 195
 196 #include <machine/frame.h>
 197 typedef struct trapframe SIGCONTEXT;
 198
 199 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 200 #define HANDLER_CONTEXT __context
 201
 202 #define EFL_sig(context)     ((context)->tf_eflags)
 203
 204 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 205 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 206
 207 #endif /* bsdi */
 208
 209 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 210
 211 typedef struct sigcontext SIGCONTEXT;
 212
 213 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 214 #define HANDLER_CONTEXT __context
 215
 216 #endif  /* *BSD */
 217
 218 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 219
 220 #ifdef _SCO_DS
 221 #include <sys/regset.h>
 222 #endif
 223 /* Solaris kludge */
 224 #undef ERR
 225 #include <sys/ucontext.h>
 226 #undef ERR
 227 typedef struct ucontext SIGCONTEXT;
 228
 229 #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
 230 #define HANDLER_CONTEXT __context
 231
 232 #endif  /* svr4 || SCO_DS */
 233
 234 #ifdef __EMX__
 235
 236 typedef struct
 237 {
 238     unsigned long ContextFlags;
 239     FLOATING_SAVE_AREA sc_float;
 240     unsigned long sc_gs;
 241     unsigned long sc_fs;
 242     unsigned long sc_es;
 243     unsigned long sc_ds;
 244     unsigned long sc_edi;
 245     unsigned long sc_esi;
 246     unsigned long sc_eax;
 247     unsigned long sc_ebx;
 248     unsigned long sc_ecx;
 249     unsigned long sc_edx;
 250     unsigned long sc_ebp;
 251     unsigned long sc_eip;
 252     unsigned long sc_cs;
 253     unsigned long sc_eflags;
 254     unsigned long sc_esp;
 255     unsigned long sc_ss;
 256 } SIGCONTEXT;
 257
 258 #endif  /* __EMX__ */
 259
 260 #ifdef __CYGWIN__
 261
 262 /* FIXME: This section is just here so it can compile, it's most likely
 263  * completely wrong. */
 264
 265 typedef struct
 266 {
 267     unsigned short sc_gs, __gsh;
 268     unsigned short sc_fs, __fsh;
 269     unsigned short sc_es, __esh;
 270     unsigned short sc_ds, __dsh;
 271     unsigned long sc_edi;
 272     unsigned long sc_esi;
 273     unsigned long sc_ebp;
 274     unsigned long sc_esp;
 275     unsigned long sc_ebx;
 276     unsigned long sc_edx;
 277     unsigned long sc_ecx;
 278     unsigned long sc_eax;
 279     unsigned long sc_trapno;
 280     unsigned long sc_err;
 281     unsigned long sc_eip;
 282     unsigned short sc_cs, __csh;
 283     unsigned long sc_eflags;
 284     unsigned long esp_at_signal;
 285     unsigned short sc_ss, __ssh;
 286     unsigned long i387;
 287     unsigned long oldmask;
 288     unsigned long cr2;
 289 } SIGCONTEXT;
 290
 291 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
 292 #define HANDLER_CONTEXT (&__context)
 293
 294 #endif /* __CYGWIN__ */
 295
 296 #ifdef __APPLE__
 297 # include <sys/ucontext.h>
 298 # include <sys/types.h>
 299 # include <signal.h>
 300
 301 typedef siginfo_t siginfo;
 302 typedef struct ucontext SIGCONTEXT;
 303
 304 # define HANDLER_DEF(name) void name( int __signal, siginfo *__siginfo, SIGCONTEXT *__context )
 305 # define HANDLER_CONTEXT (__context)
 306
 307 #endif /* __APPLE__ */
 308
 309 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
 310     defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
 311
 312 #define EAX_sig(context)     ((context)->sc_eax)
 313 #define EBX_sig(context)     ((context)->sc_ebx)
 314 #define ECX_sig(context)     ((context)->sc_ecx)
 315 #define EDX_sig(context)     ((context)->sc_edx)
 316 #define ESI_sig(context)     ((context)->sc_esi)
 317 #define EDI_sig(context)     ((context)->sc_edi)
 318 #define EBP_sig(context)     ((context)->sc_ebp)
 319
 320 #define CS_sig(context)      ((context)->sc_cs)
 321 #define DS_sig(context)      ((context)->sc_ds)
 322 #define ES_sig(context)      ((context)->sc_es)
 323 #define FS_sig(context)      ((context)->sc_fs)
 324 #define GS_sig(context)      ((context)->sc_gs)
 325 #define SS_sig(context)      ((context)->sc_ss)
 326
 327 #define TRAP_sig(context)    ((context)->sc_trapno)
 328
 329 #ifdef __NetBSD__
 330 #define ERROR_sig(context)   ((context)->sc_err)
 331 #endif
 332
 333 #ifdef linux
 334 #define ERROR_sig(context)   ((context)->sc_err)
 335 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 336 #define FAULT_ADDRESS        ((void *)HANDLER_CONTEXT->cr2)
 337 #endif
 338
 339 #ifdef __FreeBSD__
 340 #define EFL_sig(context)     ((context)->sc_efl)
 341 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 342 #define FAULT_ADDRESS        ((void *)HANDLER_CONTEXT->sc_err)
 343 #else
 344 #define EFL_sig(context)     ((context)->sc_eflags)
 345 #endif
 346
 347 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 348 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 349
 350 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 351
 352 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 353
 354 #ifdef _SCO_DS
 355 #define gregs regs
 356 #endif
 357
 358 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 359 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 360 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 361 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 362 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 363 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 364 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 365
 366 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 367 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 368 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 369 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 370
 371 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 372 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 373
 374 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 375
 376 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 377 #ifdef UESP
 378 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[UESP])
 379 #elif defined(R_ESP)
 380 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 381 #else
 382 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 383 #endif
 384 #ifdef TRAPNO
 385 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 386 #endif
 387
 388 #define FAULT_ADDRESS         (__siginfo->si_addr)
 389
 390 #endif  /* svr4 || SCO_DS */
 391
 392 #ifdef __APPLE__
 393 #define EAX_sig(context)     ((context)->uc_mcontext.sc_eax)
 394 #define EBX_sig(context)     ((context)->uc_mcontext.sc_ebx)
 395 #define ECX_sig(context)     ((context)->uc_mcontext.sc_ecx)
 396 #define EDX_sig(context)     ((context)->uc_mcontext.sc_edx)
 397 #define ESI_sig(context)     ((context)->uc_mcontext.sc_esi)
 398 #define EDI_sig(context)     ((context)->uc_mcontext.sc_edi)
 399 #define EBP_sig(context)     ((context)->uc_mcontext.sc_ebp)
 400
 401 #define CS_sig(context)      ((context)->uc_mcontext.sc_cs)
 402 #define DS_sig(context)      ((context)->uc_mcontext.sc_ds)
 403 #define ES_sig(context)      ((context)->uc_mcontext.sc_es)
 404 #define FS_sig(context)      ((context)->uc_mcontext.sc_fs)
 405 #define GS_sig(context)      ((context)->uc_mcontext.sc_gs)
 406 #define SS_sig(context)      ((context)->uc_mcontext.sc_ss)
 407
 408 #define EFL_sig(context)     ((context)->uc_mcontext.sc_eflags)
 409
 410 #define EIP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext.sc_eip))
 411 #define ESP_sig(context)     (*((unsigned long*)&(context)->uc_mcontext.sc_esp))
 412
 413 #endif /* __APPLE__ */
 414
 415 /* exception code definitions (already defined by FreeBSD/NetBSD) */
 416 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
 417 #define T_DIVIDE        0   /* Division by zero exception */
 418 #define T_TRCTRAP       1   /* Single-step exception */
 419 #define T_NMI           2   /* NMI interrupt */
 420 #define T_BPTFLT        3   /* Breakpoint exception */
 421 #define T_OFLOW         4   /* Overflow exception */
 422 #define T_BOUND         5   /* Bound range exception */
 423 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 424 #define T_DNA           7   /* Device not available exception */
 425 #define T_DOUBLEFLT     8   /* Double fault exception */
 426 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 427 #define T_TSSFLT        10  /* Invalid TSS exception */
 428 #define T_SEGNPFLT      11  /* Segment not present exception */
 429 #define T_STKFLT        12  /* Stack fault */
 430 #define T_PROTFLT       13  /* General protection fault */
 431 #define T_PAGEFLT       14  /* Page fault */
 432 #define T_RESERVED      15  /* Unknown exception */
 433 #define T_ARITHTRAP     16  /* Floating point exception */
 434 #define T_ALIGNFLT      17  /* Alignment check exception */
 435 #define T_MCHK          18  /* Machine check exception */
 436 #define T_CACHEFLT      19  /* Cache flush exception */
 437 #endif
 438 #if defined(__NetBSD__)
 439 #define T_MCHK          19  /* Machine check exception */
 440 #endif
 441
 442 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 443
 444 #include "wine/exception.h"
 445 #include "wine/debug.h"
 446
 447 WINE_DEFAULT_DEBUG_CHANNEL(seh);
 448
 449 typedef int (*wine_signal_handler)(unsigned int sig);
 450
 451 static wine_signal_handler handlers[256];
 452
 453 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
 454 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context );
 455
 456
 457 /***********************************************************************
 458  *           dispatch_signal
 459  */
 460 inline static int dispatch_signal(unsigned int sig)
 461 {
 462     if (handlers[sig] == NULL) return 0;
 463     return handlers[sig](sig);
 464 }
 465
 466
 467 /***********************************************************************
 468  *           get_trap_code
 469  *
 470  * Get the trap code for a signal.
 471  */
 472 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 473 {
 474 #ifdef TRAP_sig
 475     return TRAP_sig(sigcontext);
 476 #else
 477     return T_UNKNOWN;  /* unknown trap code */
 478 #endif
 479 }
 480
 481 /***********************************************************************
 482  *           get_error_code
 483  *
 484  * Get the error code for a signal.
 485  */
 486 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 487 {
 488 #ifdef ERROR_sig
 489     return ERROR_sig(sigcontext);
 490 #else
 491     return 0;
 492 #endif
 493 }
 494
 495 /***********************************************************************
 496  *           get_signal_stack
 497  *
 498  * Get the base of the signal stack for the current thread.
 499  */
 500 static inline void *get_signal_stack(void)
 501 {
 502     return (char *)NtCurrentTeb() + 4096;
 503 }
 504
 505
 506 /***********************************************************************
 507  *           get_current_teb
 508  *
 509  * Get the current teb based on the stack pointer.
 510  */
 511 static inline TEB *get_current_teb(void)
 512 {
 513     unsigned long esp;
 514     __asm__("movl %%esp,%0" : "=g" (esp) );
 515     return (TEB *)((esp & ~4095) - 4096);
 516 }
 517
 518
 519 #ifdef __HAVE_VM86
 520 /***********************************************************************
 521  *           save_vm86_context
 522  *
 523  * Set the register values from a vm86 structure.
 524  */
 525 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 526 {
 527     context->Eax    = vm86->regs.eax;
 528     context->Ebx    = vm86->regs.ebx;
 529     context->Ecx    = vm86->regs.ecx;
 530     context->Edx    = vm86->regs.edx;
 531     context->Esi    = vm86->regs.esi;
 532     context->Edi    = vm86->regs.edi;
 533     context->Esp    = vm86->regs.esp;
 534     context->Ebp    = vm86->regs.ebp;
 535     context->Eip    = vm86->regs.eip;
 536     context->SegCs  = vm86->regs.cs;
 537     context->SegDs  = vm86->regs.ds;
 538     context->SegEs  = vm86->regs.es;
 539     context->SegFs  = vm86->regs.fs;
 540     context->SegGs  = vm86->regs.gs;
 541     context->SegSs  = vm86->regs.ss;
 542     context->EFlags = vm86->regs.eflags;
 543 }
 544
 545
 546 /***********************************************************************
 547  *           restore_vm86_context
 548  *
 549  * Build a vm86 structure from the register values.
 550  */
 551 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 552 {
 553     vm86->regs.eax    = context->Eax;
 554     vm86->regs.ebx    = context->Ebx;
 555     vm86->regs.ecx    = context->Ecx;
 556     vm86->regs.edx    = context->Edx;
 557     vm86->regs.esi    = context->Esi;
 558     vm86->regs.edi    = context->Edi;
 559     vm86->regs.esp    = context->Esp;
 560     vm86->regs.ebp    = context->Ebp;
 561     vm86->regs.eip    = context->Eip;
 562     vm86->regs.cs     = context->SegCs;
 563     vm86->regs.ds     = context->SegDs;
 564     vm86->regs.es     = context->SegEs;
 565     vm86->regs.fs     = context->SegFs;
 566     vm86->regs.gs     = context->SegGs;
 567     vm86->regs.ss     = context->SegSs;
 568     vm86->regs.eflags = context->EFlags;
 569 }
 570
 571
 572 /**********************************************************************
 573  *              merge_vm86_pending_flags
 574  *
 575  * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
 576  * raises exception if there are pending events and VIF flag
 577  * has been turned on.
 578  *
 579  * Called from __wine_enter_vm86 because vm86_enter
 580  * doesn't check for pending events.
 581  *
 582  * Called from raise_vm86_sti_exception to check for
 583  * pending events in a signal safe way.
 584  */
 585 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
 586 {
 587     BOOL check_pending = TRUE;
 588     struct vm86plus_struct *vm86 =
 589         (struct vm86plus_struct*)(NtCurrentTeb()->vm86_ptr);
 590
 591     /*
 592      * In order to prevent a race when SIGUSR2 occurs while
 593      * we are returning from exception handler, pending events
 594      * will be rechecked after each raised exception.
 595      */
 596     while (check_pending && NtCurrentTeb()->vm86_pending)
 597     {
 598         check_pending = FALSE;
 599         NtCurrentTeb()->vm86_ptr = NULL;
 600
 601         /*
 602          * If VIF is set, throw exception.
 603          * Note that SIGUSR2 may turn VIF flag off so
 604          * VIF check must occur only when TEB.vm86_ptr is NULL.
 605          */
 606         if (vm86->regs.eflags & VIF_MASK)
 607         {
 608             CONTEXT vcontext;
 609             save_vm86_context( &vcontext, vm86 );
 610
 611             rec->ExceptionCode    = EXCEPTION_VM86_STI;
 612             rec->ExceptionFlags   = EXCEPTION_CONTINUABLE;
 613             rec->ExceptionRecord  = NULL;
 614             rec->NumberParameters = 0;
 615             rec->ExceptionAddress = (LPVOID)vcontext.Eip;
 616
 617             vcontext.EFlags &= ~VIP_MASK;
 618             NtCurrentTeb()->vm86_pending = 0;
 619             EXC_RtlRaiseException( rec, &vcontext );
 620
 621             restore_vm86_context( &vcontext, vm86 );
 622             check_pending = TRUE;
 623         }
 624
 625         NtCurrentTeb()->vm86_ptr = vm86;
 626     }
 627
 628     /*
 629      * Merge VIP flags in a signal safe way. This requires
 630      * that the following operation compiles into atomic
 631      * instruction.
 632      */
 633     vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
 634 }
 635 #endif /* __HAVE_VM86 */
 636
 637
 638 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
 639
 640
 641 /***********************************************************************
 642  *           init_handler
 643  *
 644  * Handler initialization when the full context is not needed.
 645  */
 646 static void *init_handler( const SIGCONTEXT *sigcontext )
 647 {
 648     void *stack = (void *)ESP_sig(sigcontext);
 649     TEB *teb = get_current_teb();
 650
 651     wine_set_fs( teb->teb_sel );
 652
 653     /* now restore a proper %gs for the fault handler */
 654     if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
 655         !wine_ldt_is_system(SS_sig(sigcontext)))  /* 16-bit mode */
 656     {
 657         /*
 658          * Win16 or DOS protected mode. Note that during switch
 659          * from 16-bit mode to linear mode, CS may be set to system
 660          * segment before FS is restored. Fortunately, in this case
 661          * SS is still non-system segment. This is why both CS and SS
 662          * are checked.
 663          */
 664         wine_set_gs( teb->gs_sel );
 665         stack = (void *)teb->cur_stack;
 666     }
 667 #ifdef __HAVE_VM86
 668     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 669     {
 670         unsigned int *int_stack = stack;
 671         /* fetch the saved %gs from the stack */
 672         wine_set_gs( int_stack[0] );
 673     }
 674 #endif
 675     else  /* 32-bit mode */
 676     {
 677 #ifdef GS_sig
 678         wine_set_gs( GS_sig(sigcontext) );
 679 #endif
 680     }
 681     return stack;
 682 }
 683
 684
 685 /***********************************************************************
 686  *           save_fpu
 687  *
 688  * Set the FPU context from a sigcontext.
 689  */
 690 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 691 {
 692 #ifdef FPU_sig
 693     if (FPU_sig(sigcontext))
 694     {
 695         context->FloatSave = *FPU_sig(sigcontext);
 696         return;
 697     }
 698 #endif  /* FPU_sig */
 699 #ifdef __GNUC__
 700     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 701 #endif  /* __GNUC__ */
 702 }
 703
 704
 705 /***********************************************************************
 706  *           restore_fpu
 707  *
 708  * Restore the FPU context to a sigcontext.
 709  */
 710 inline static void restore_fpu( CONTEXT *context )
 711 {
 712     /* reset the current interrupt status */
 713     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 714 #ifdef __GNUC__
 715     /* avoid nested exceptions */
 716     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 717 #endif  /* __GNUC__ */
 718 }
 719
 720
 721 /***********************************************************************
 722  *           setup_exception
 723  *
 724  * Setup a proper stack frame for the raise function, and modify the
 725  * sigcontext so that the return from the signal handler will call
 726  * the raise function.
 727  */
 728 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
 729 {
 730     struct stack_layout
 731     {
 732         void             *ret_addr;      /* return address from raise_func */
 733         EXCEPTION_RECORD *rec_ptr;       /* first arg for raise_func */
 734         CONTEXT          *context_ptr;   /* second arg for raise_func */
 735         void             *dummy;         /* dummy ret addr for __wine_call_from_32_restore_regs */
 736         CONTEXT           context;
 737         EXCEPTION_RECORD  rec;
 738         DWORD             ebp;
 739         DWORD             eip;
 740     } *stack;
 741
 742     WORD fs, gs;
 743
 744     /* get %fs and %gs at time of the fault */
 745 #ifdef FS_sig
 746     fs = LOWORD(FS_sig(sigcontext));
 747 #else
 748     fs = wine_get_fs();
 749 #endif
 750 #ifdef GS_sig
 751     gs = LOWORD(GS_sig(sigcontext));
 752 #else
 753     gs = wine_get_gs();
 754 #endif
 755
 756     stack = init_handler( sigcontext );
 757
 758     /* stack sanity checks */
 759
 760     if ((char *)stack >= (char *)get_signal_stack() &&
 761         (char *)stack < (char *)get_signal_stack() + SIGNAL_STACK_SIZE)
 762     {
 763         ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
 764              GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
 765              NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
 766         server_abort_thread(1);
 767     }
 768
 769     if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
 770         (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
 771     {
 772         UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack;
 773         if (diff < 4096)
 774         {
 775             ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
 776                  diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
 777                  NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
 778             server_abort_thread(1);
 779         }
 780         else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
 781                    GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
 782                    NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
 783     }
 784
 785     stack--;  /* push the stack_layout structure */
 786     stack->ret_addr     = __wine_call_from_32_restore_regs;
 787     stack->rec_ptr      = &stack->rec;
 788     stack->context_ptr  = &stack->context;
 789
 790     stack->rec.ExceptionRecord  = NULL;
 791     stack->rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 792     stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
 793     stack->rec.NumberParameters = 0;
 794
 795     stack->context.ContextFlags = CONTEXT_FULL;
 796     stack->context.Eax          = EAX_sig(sigcontext);
 797     stack->context.Ebx          = EBX_sig(sigcontext);
 798     stack->context.Ecx          = ECX_sig(sigcontext);
 799     stack->context.Edx          = EDX_sig(sigcontext);
 800     stack->context.Esi          = ESI_sig(sigcontext);
 801     stack->context.Edi          = EDI_sig(sigcontext);
 802     stack->context.Ebp          = EBP_sig(sigcontext);
 803     stack->context.EFlags       = EFL_sig(sigcontext);
 804     stack->context.Eip          = EIP_sig(sigcontext);
 805     stack->context.Esp          = ESP_sig(sigcontext);
 806     stack->context.SegCs        = LOWORD(CS_sig(sigcontext));
 807     stack->context.SegDs        = LOWORD(DS_sig(sigcontext));
 808     stack->context.SegEs        = LOWORD(ES_sig(sigcontext));
 809     stack->context.SegFs        = fs;
 810     stack->context.SegGs        = gs;
 811     stack->context.SegSs        = LOWORD(SS_sig(sigcontext));
 812
 813     /* now modify the sigcontext to return to the raise function */
 814     ESP_sig(sigcontext) = (DWORD)stack;
 815     EIP_sig(sigcontext) = (DWORD)func;
 816     CS_sig(sigcontext)  = wine_get_cs();
 817     DS_sig(sigcontext)  = wine_get_ds();
 818     ES_sig(sigcontext)  = wine_get_es();
 819     FS_sig(sigcontext)  = wine_get_fs();
 820     GS_sig(sigcontext)  = wine_get_gs();
 821     SS_sig(sigcontext)  = wine_get_ss();
 822
 823     return stack->rec_ptr;
 824 }
 825
 826
 827 /***********************************************************************
 828  *           get_exception_context
 829  *
 830  * Get a pointer to the context built by setup_exception.
 831  */
 832 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
 833 {
 834     return (CONTEXT *)rec - 1;  /* cf. stack_layout structure */
 835 }
 836
 837
 838 /**********************************************************************
 839  *              get_fpu_code
 840  *
 841  * Get the FPU exception code from the FPU status.
 842  */
 843 static inline DWORD get_fpu_code( const CONTEXT *context )
 844 {
 845     DWORD status = context->FloatSave.StatusWord;
 846
 847     if (status & 0x01)  /* IE */
 848     {
 849         if (status & 0x40)  /* SF */
 850             return EXCEPTION_FLT_STACK_CHECK;
 851         else
 852             return EXCEPTION_FLT_INVALID_OPERATION;
 853     }
 854     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 855     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 856     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 857     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 858     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 859     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 860 }
 861
 862
 863 /**********************************************************************
 864  *              raise_segv_exception
 865  */
 866 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
 867 {
 868     switch(rec->ExceptionCode)
 869     {
 870     case EXCEPTION_ACCESS_VIOLATION:
 871         if (rec->NumberParameters == 2)
 872         {
 873             if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] )))
 874                 return;
 875         }
 876         break;
 877     case EXCEPTION_DATATYPE_MISALIGNMENT:
 878         /* FIXME: pass through exception handler first? */
 879         if (context->EFlags & 0x00040000)
 880         {
 881             /* Disable AC flag, return */
 882             context->EFlags &= ~0x00040000;
 883             return;
 884         }
 885         break;
 886     }
 887     EXC_RtlRaiseException( rec, context );
 888 }
 889
 890
 891 /**********************************************************************
 892  *              raise_trap_exception
 893  */
 894 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
 895 {
 896     DWORD dr0, dr1, dr2, dr3, dr6, dr7;
 897
 898     if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
 899     {
 900         if (context->EFlags & 0x100)
 901         {
 902             context->EFlags &= ~0x100;  /* clear single-step flag */
 903         }
 904         else  /* hardware breakpoint, fetch the debug registers */
 905         {
 906             context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
 907             NtGetContextThread(GetCurrentThread(), context);
 908             /* do we really have a bp from a debug register ?
 909              * if not, then someone did a kill(SIGTRAP) on us, and we
 910              * shall return a breakpoint, not a single step exception
 911              */
 912             if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
 913         }
 914     }
 915
 916     dr0 = context->Dr0;
 917     dr1 = context->Dr1;
 918     dr2 = context->Dr2;
 919     dr3 = context->Dr3;
 920     dr6 = context->Dr6;
 921     dr7 = context->Dr7;
 922
 923     EXC_RtlRaiseException( rec, context );
 924
 925     if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
 926         dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
 927     {
 928         /* the debug registers have changed, set the new values */
 929         context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
 930         NtSetContextThread(GetCurrentThread(), context);
 931     }
 932 }
 933
 934
 935 /**********************************************************************
 936  *              raise_fpu_exception
 937  */
 938 static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
 939 {
 940     EXC_RtlRaiseException( rec, context );
 941     restore_fpu( context );
 942 }
 943
 944
 945 #ifdef __HAVE_VM86
 946 /**********************************************************************
 947  *              raise_vm86_sti_exception
 948  */
 949 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
 950 {
 951     /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
 952     NtCurrentTeb()->vm86_pending |= VIP_MASK;
 953
 954     if (NtCurrentTeb()->vm86_ptr)
 955     {
 956         if (((char*)context->Eip >= (char*)vm86_return) &&
 957             ((char*)context->Eip <= (char*)vm86_return_end) &&
 958             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
 959             /* exiting from VM86, can't throw */
 960             return;
 961         }
 962         merge_vm86_pending_flags( rec );
 963     }
 964     else if (NtCurrentTeb()->dpmi_vif &&
 965              !wine_ldt_is_system(context->SegCs) &&
 966              !wine_ldt_is_system(context->SegSs))
 967     {
 968         /* Executing DPMI code and virtual interrupts are enabled. */
 969         NtCurrentTeb()->vm86_pending = 0;
 970         EXC_RtlRaiseException( rec, context );
 971     }
 972 }
 973
 974
 975 /**********************************************************************
 976  *              usr2_handler
 977  *
 978  * Handler for SIGUSR2.
 979  * We use it to signal that the running __wine_enter_vm86() should
 980  * immediately set VIP_MASK, causing pending events to be handled
 981  * as early as possible.
 982  */
 983 static HANDLER_DEF(usr2_handler)
 984 {
 985     EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
 986     rec->ExceptionCode = EXCEPTION_VM86_STI;
 987 }
 988 #endif /* __HAVE_VM86 */
 989
 990
 991 /**********************************************************************
 992  *              segv_handler
 993  *
 994  * Handler for SIGSEGV and related errors.
 995  */
 996 static HANDLER_DEF(segv_handler)
 997 {
 998     EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
 999
1000     switch(get_trap_code(HANDLER_CONTEXT))
1001     {
1002     case T_OFLOW:   /* Overflow exception */
1003         rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1004         break;
1005     case T_BOUND:   /* Bound range exception */
1006         rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1007         break;
1008     case T_PRIVINFLT:   /* Invalid opcode exception */
1009         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1010         break;
1011     case T_STKFLT:  /* Stack fault */
1012         rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1013         break;
1014     case T_SEGNPFLT:  /* Segment not present exception */
1015     case T_PROTFLT:   /* General protection fault */
1016     case T_UNKNOWN:   /* Unknown fault code */
1017         rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
1018                                                              : EXCEPTION_PRIV_INSTRUCTION;
1019         break;
1020     case T_PAGEFLT:  /* Page fault */
1021         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1022 #ifdef FAULT_ADDRESS
1023         rec->NumberParameters = 2;
1024         rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
1025         rec->ExceptionInformation[1] = (DWORD)FAULT_ADDRESS;
1026 #endif
1027         break;
1028     case T_ALIGNFLT:  /* Alignment check exception */
1029         rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1030         break;
1031     default:
1032         ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1033         /* fall through */
1034     case T_NMI:       /* NMI interrupt */
1035     case T_DNA:       /* Device not available exception */
1036     case T_DOUBLEFLT: /* Double fault exception */
1037     case T_TSSFLT:    /* Invalid TSS exception */
1038     case T_RESERVED:  /* Unknown exception */
1039     case T_MCHK:      /* Machine check exception */
1040 #ifdef T_CACHEFLT
1041     case T_CACHEFLT:  /* Cache flush exception */
1042 #endif
1043         rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1044         break;
1045     }
1046 }
1047
1048
1049 /**********************************************************************
1050  *              trap_handler
1051  *
1052  * Handler for SIGTRAP.
1053  */
1054 static HANDLER_DEF(trap_handler)
1055 {
1056     EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
1057
1058     switch(get_trap_code(HANDLER_CONTEXT))
1059     {
1060     case T_TRCTRAP:  /* Single-step exception */
1061         rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1062         EFL_sig(HANDLER_CONTEXT) &= ~0x100;  /* clear single-step flag */
1063         break;
1064     case T_BPTFLT:   /* Breakpoint exception */
1065         rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1;  /* back up over the int3 instruction */
1066         /* fall through */
1067     default:
1068         rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1069         break;
1070     }
1071 }
1072
1073
1074 /**********************************************************************
1075  *              fpe_handler
1076  *
1077  * Handler for SIGFPE.
1078  */
1079 static HANDLER_DEF(fpe_handler)
1080 {
1081     EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception );
1082     CONTEXT *context;
1083
1084     context = get_exception_context( rec );
1085     save_fpu( context, HANDLER_CONTEXT );
1086
1087     switch(get_trap_code(HANDLER_CONTEXT))
1088     {
1089     case T_DIVIDE:   /* Division by zero exception */
1090         rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1091         break;
1092     case T_FPOPFLT:   /* Coprocessor segment overrun */
1093         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1094         break;
1095     case T_ARITHTRAP:  /* Floating point exception */
1096     case T_UNKNOWN:    /* Unknown fault code */
1097         rec->ExceptionCode = get_fpu_code( context );
1098         break;
1099     default:
1100         ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1101         rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1102         break;
1103     }
1104 }
1105
1106
1107 /**********************************************************************
1108  *              int_handler
1109  *
1110  * Handler for SIGINT.
1111  */
1112 static HANDLER_DEF(int_handler)
1113 {
1114     init_handler( HANDLER_CONTEXT );
1115     if (!dispatch_signal(SIGINT))
1116     {
1117         EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
1118         rec->ExceptionCode = CONTROL_C_EXIT;
1119     }
1120 }
1121
1122 /**********************************************************************
1123  *              abrt_handler
1124  *
1125  * Handler for SIGABRT.
1126  */
1127 static HANDLER_DEF(abrt_handler)
1128 {
1129     EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
1130     rec->ExceptionCode  = EXCEPTION_WINE_ASSERTION;
1131     rec->ExceptionFlags = EH_NONCONTINUABLE;
1132 }
1133
1134
1135 /**********************************************************************
1136  *              term_handler
1137  *
1138  * Handler for SIGTERM.
1139  */
1140 static HANDLER_DEF(term_handler)
1141 {
1142     init_handler( HANDLER_CONTEXT );
1143     server_abort_thread(0);
1144 }
1145
1146
1147 /**********************************************************************
1148  *              usr1_handler
1149  *
1150  * Handler for SIGUSR1, used to signal a thread that it got suspended.
1151  */
1152 static HANDLER_DEF(usr1_handler)
1153 {
1154     LARGE_INTEGER timeout;
1155
1156     init_handler( HANDLER_CONTEXT );
1157     /* wait with 0 timeout, will only return once the thread is no longer suspended */
1158     timeout.QuadPart = 0;
1159     NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout );
1160 }
1161
1162
1163 /***********************************************************************
1164  *           set_handler
1165  *
1166  * Set a signal handler
1167  */
1168 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1169 {
1170     struct sigaction sig_act;
1171
1172 #ifdef linux
1173     if (!have_sigaltstack)
1174     {
1175         struct kernel_sigaction sig_act;
1176         sig_act.ksa_handler = func;
1177         sig_act.ksa_flags   = SA_RESTART;
1178         sig_act.ksa_mask    = (1 << (SIGINT-1)) |
1179                               (1 << (SIGUSR2-1));
1180         /* point to the top of the signal stack */
1181         sig_act.ksa_restorer = (char *)get_signal_stack() + SIGNAL_STACK_SIZE;
1182         return wine_sigaction( sig, &sig_act, NULL );
1183     }
1184 #endif  /* linux */
1185     sig_act.sa_handler = func;
1186     sigemptyset( &sig_act.sa_mask );
1187     sigaddset( &sig_act.sa_mask, SIGINT );
1188     sigaddset( &sig_act.sa_mask, SIGUSR2 );
1189
1190 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
1191     sig_act.sa_flags = SA_RESTART;
1192 #elif defined (__svr4__) || defined(_SCO_DS)
1193     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1194 #else
1195     sig_act.sa_flags = 0;
1196 #endif
1197
1198 #ifdef SA_ONSTACK
1199     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1200 #endif
1201     return sigaction( sig, &sig_act, NULL );
1202 }
1203
1204
1205 /***********************************************************************
1206  *           __wine_set_signal_handler   (NTDLL.@)
1207  */
1208 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1209 {
1210     if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1211     if (handlers[sig] != NULL) return -2;
1212     handlers[sig] = wsh;
1213     return 0;
1214 }
1215
1216
1217 /**********************************************************************
1218  *              SIGNAL_Init
1219  */
1220 BOOL SIGNAL_Init(void)
1221 {
1222     int have_sigaltstack = 0;
1223
1224 #ifdef HAVE_SIGALTSTACK
1225     struct sigaltstack ss;
1226     ss.ss_sp    = get_signal_stack();
1227     ss.ss_size  = SIGNAL_STACK_SIZE;
1228     ss.ss_flags = 0;
1229     if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1230 #ifdef linux
1231     /* sigaltstack may fail because the kernel is too old, or
1232        because glibc is brain-dead. In the latter case a
1233        direct system call should succeed. */
1234     else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1235 #endif  /* linux */
1236 #endif  /* HAVE_SIGALTSTACK */
1237
1238     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1239     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1240     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1241     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1242     if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1243     if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1244     if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1245 #ifdef SIGBUS
1246     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1247 #endif
1248 #ifdef SIGTRAP
1249     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1250 #endif
1251
1252 #ifdef __HAVE_VM86
1253     if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1254 #endif
1255
1256     return TRUE;
1257
1258  error:
1259     perror("sigaction");
1260     return FALSE;
1261 }
1262
1263
1264 #ifdef __HAVE_VM86
1265 /**********************************************************************
1266  *              __wine_enter_vm86   (NTDLL.@)
1267  *
1268  * Enter vm86 mode with the specified register context.
1269  */
1270 void __wine_enter_vm86( CONTEXT *context )
1271 {
1272     EXCEPTION_RECORD rec;
1273     TEB *teb = NtCurrentTeb();
1274     int res;
1275     struct vm86plus_struct vm86;
1276
1277     memset( &vm86, 0, sizeof(vm86) );
1278     for (;;)
1279     {
1280         restore_vm86_context( context, &vm86 );
1281
1282         teb->vm86_ptr = &vm86;
1283         merge_vm86_pending_flags( &rec );
1284
1285         res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1286         if (res < 0)
1287         {
1288             errno = -res;
1289             return;
1290         }
1291
1292         save_vm86_context( context, &vm86 );
1293
1294         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
1295         rec.ExceptionRecord  = NULL;
1296         rec.ExceptionAddress = (LPVOID)context->Eip;
1297         rec.NumberParameters = 0;
1298
1299         switch(VM86_TYPE(res))
1300         {
1301         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1302             rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1303             raise_segv_exception( &rec, context );
1304             continue;
1305         case VM86_TRAP: /* return due to DOS-debugger request */
1306             switch(VM86_ARG(res))
1307             {
1308             case T_TRCTRAP:  /* Single-step exception, single step flag is cleared by raise_trap_exception */
1309                 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1310                 break;
1311             case T_BPTFLT:   /* Breakpoint exception */
1312                 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
1313                 /* fall through */
1314             default:
1315                 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1316                 break;
1317             }
1318             raise_trap_exception( &rec, context );
1319             continue;
1320         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1321             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1322             rec.NumberParameters = 1;
1323             rec.ExceptionInformation[0] = VM86_ARG(res);
1324             break;
1325         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1326             context->EFlags |= VIF_MASK;
1327             context->EFlags &= ~VIP_MASK;
1328             teb->vm86_pending = 0;
1329             rec.ExceptionCode = EXCEPTION_VM86_STI;
1330             break;
1331         case VM86_PICRETURN: /* return due to pending PIC request */
1332             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1333             break;
1334         case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1335         default:
1336             ERR( "unhandled result from vm86 mode %x\n", res );
1337             continue;
1338         }
1339         EXC_RtlRaiseException( &rec, context );
1340     }
1341 }
1342
1343 #else /* __HAVE_VM86 */
1344 /**********************************************************************
1345  *              __wine_enter_vm86   (NTDLL.@)
1346  */
1347 void __wine_enter_vm86( CONTEXT *context )
1348 {
1349     MESSAGE("vm86 mode not supported on this platform\n");
1350 }
1351 #endif /* __HAVE_VM86 */
1352
1353 /**********************************************************************
1354  *              DbgBreakPoint   (NTDLL.@)
1355  */
1356 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1357
1358 /**********************************************************************
1359  *              DbgUserBreakPoint   (NTDLL.@)
1360  */
1361 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1362
1363 #endif  /* __i386__ */