dlls/ntdll/signal_i386.c

   1 /*
   2  * i386 signal handling routines
   3  *
   4  * Copyright 1999 Alexandre Julliard
   5  */
   6
   7 #ifdef __i386__
   8
   9 #include "config.h"
  10
  11 #include <errno.h>
  12 #include <signal.h>
  13 #include <stdlib.h>
  14 #include <stdio.h>
  15 #include <unistd.h>
  16
  17 #ifdef HAVE_SYS_PARAM_H
  18 # include <sys/param.h>
  19 #endif
  20 #ifdef HAVE_SYSCALL_H
  21 # include <syscall.h>
  22 #else
  23 # ifdef HAVE_SYS_SYSCALL_H
  24 #  include <sys/syscall.h>
  25 # endif
  26 #endif
  27
  28 #ifdef HAVE_SYS_VM86_H
  29 # include <sys/vm86.h>
  30 #endif
  31
  32 #include "selectors.h"
  33
  34 /***********************************************************************
  35  * signal context platform-specific definitions
  36  */
  37
  38 #ifdef linux
  39 typedef struct
  40 {
  41     unsigned short sc_gs, __gsh;
  42     unsigned short sc_fs, __fsh;
  43     unsigned short sc_es, __esh;
  44     unsigned short sc_ds, __dsh;
  45     unsigned long sc_edi;
  46     unsigned long sc_esi;
  47     unsigned long sc_ebp;
  48     unsigned long sc_esp;
  49     unsigned long sc_ebx;
  50     unsigned long sc_edx;
  51     unsigned long sc_ecx;
  52     unsigned long sc_eax;
  53     unsigned long sc_trapno;
  54     unsigned long sc_err;
  55     unsigned long sc_eip;
  56     unsigned short sc_cs, __csh;
  57     unsigned long sc_eflags;
  58     unsigned long esp_at_signal;
  59     unsigned short sc_ss, __ssh;
  60     unsigned long i387;
  61     unsigned long oldmask;
  62     unsigned long cr2;
  63 } SIGCONTEXT;
  64
  65 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
  66 #define HANDLER_CONTEXT (&__context)
  67
  68 /* this is the sigaction structure from the Linux 2.1.20 kernel.  */
  69 struct kernel_sigaction
  70 {
  71     void (*ksa_handler)();
  72     unsigned long ksa_mask;
  73     unsigned long ksa_flags;
  74     void *ksa_restorer;
  75 };
  76
  77 /* Similar to the sigaction function in libc, except it leaves alone the
  78    restorer field, which is used to specify the signal stack address */
  79 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
  80                                   struct kernel_sigaction *old )
  81 {
  82     __asm__ __volatile__( "pushl %%ebx\n\t"
  83                           "movl %2,%%ebx\n\t"
  84                           "int $0x80\n\t"
  85                           "popl %%ebx"
  86                           : "=a" (sig)
  87                           : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
  88     if (sig>=0) return 0;
  89     errno = -sig;
  90     return -1;
  91 }
  92
  93 #ifdef HAVE_SIGALTSTACK
  94 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
  95 static inline int wine_sigaltstack( const struct sigaltstack *new,
  96                                     struct sigaltstack *old )
  97 {
  98     int ret;
  99     __asm__ __volatile__( "pushl %%ebx\n\t"
 100                           "movl %2,%%ebx\n\t"
 101                           "int $0x80\n\t"
 102                           "popl %%ebx"
 103                           : "=a" (ret)
 104                           : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
 105     if (ret >= 0) return 0;
 106     errno = -ret;
 107     return -1;
 108 }
 109 #endif
 110
 111 static inline int wine_vm86plus( int func, struct vm86plus_struct *ptr )
 112 {
 113     int res;
 114     __asm__ __volatile__( "pushl %%fs\n\t"
 115                           "pushl %%ebx\n\t"
 116                           "movl %2,%%ebx\n\t"
 117                           "int $0x80\n\t"
 118                           "popl %%ebx\n\t"
 119                           "popl %%fs"
 120                           : "=a" (res)
 121                           : "0" (166 /*SYS_vm86*/), "g" (func), "c" (ptr) );
 122     if (res >= 0) return res;
 123     errno = -res;
 124     return -1;
 125 }
 126
 127 #endif  /* linux */
 128
 129 #ifdef BSDI
 130
 131 #define EAX_sig(context)     ((context)->tf_eax)
 132 #define EBX_sig(context)     ((context)->tf_ebx)
 133 #define ECX_sig(context)     ((context)->tf_ecx)
 134 #define EDX_sig(context)     ((context)->tf_edx)
 135 #define ESI_sig(context)     ((context)->tf_esi)
 136 #define EDI_sig(context)     ((context)->tf_edi)
 137 #define EBP_sig(context)     ((context)->tf_ebp)
 138
 139 #define CS_sig(context)      ((context)->tf_cs)
 140 #define DS_sig(context)      ((context)->tf_ds)
 141 #define ES_sig(context)      ((context)->tf_es)
 142 #define SS_sig(context)      ((context)->tf_ss)
 143
 144 #include <machine/frame.h>
 145 typedef struct trapframe SIGCONTEXT;
 146
 147 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 148 #define HANDLER_CONTEXT __context
 149
 150 #define EFL_sig(context)     ((context)->tf_eflags)
 151
 152 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 153 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 154
 155 #endif /* bsdi */
 156
 157 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 158
 159 typedef struct sigcontext SIGCONTEXT;
 160
 161 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 162 #define HANDLER_CONTEXT __context
 163
 164 #endif  /* FreeBSD */
 165
 166 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 167
 168 #ifdef _SCO_DS
 169 #include <sys/regset.h>
 170 #endif
 171 /* Solaris kludge */
 172 #undef ERR
 173 #include <sys/ucontext.h>
 174 #undef ERR
 175 typedef struct ucontext SIGCONTEXT;
 176
 177 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
 178 #define HANDLER_CONTEXT __context
 179
 180 #endif  /* svr4 || SCO_DS */
 181
 182 #ifdef __EMX__
 183
 184 typedef struct
 185 {
 186     unsigned long ContextFlags;
 187     FLOATING_SAVE_AREA sc_float;
 188     unsigned long sc_gs;
 189     unsigned long sc_fs;
 190     unsigned long sc_es;
 191     unsigned long sc_ds;
 192     unsigned long sc_edi;
 193     unsigned long sc_esi;
 194     unsigned long sc_eax;
 195     unsigned long sc_ebx;
 196     unsigned long sc_ecx;
 197     unsigned long sc_edx;
 198     unsigned long sc_ebp;
 199     unsigned long sc_eip;
 200     unsigned long sc_cs;
 201     unsigned long sc_eflags;
 202     unsigned long sc_esp;
 203     unsigned long sc_ss;
 204 } SIGCONTEXT;
 205
 206 #endif  /* __EMX__ */
 207
 208
 209 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__EMX__)
 210
 211 #define EAX_sig(context)     ((context)->sc_eax)
 212 #define EBX_sig(context)     ((context)->sc_ebx)
 213 #define ECX_sig(context)     ((context)->sc_ecx)
 214 #define EDX_sig(context)     ((context)->sc_edx)
 215 #define ESI_sig(context)     ((context)->sc_esi)
 216 #define EDI_sig(context)     ((context)->sc_edi)
 217 #define EBP_sig(context)     ((context)->sc_ebp)
 218
 219 #define CS_sig(context)      ((context)->sc_cs)
 220 #define DS_sig(context)      ((context)->sc_ds)
 221 #define ES_sig(context)      ((context)->sc_es)
 222 #define SS_sig(context)      ((context)->sc_ss)
 223
 224 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
 225  * saved by the exception handling. duh.
 226  * Actually they are in -current (have been for a while), and that
 227  * patch now finally has been MFC'd to -stable too (Nov 15 1999).
 228  * If you're running a system from the -stable branch older than that,
 229  * like a 3.3-RELEASE, grab the patch from the ports tree:
 230  * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
 231  * (If its not yet there when you look, go here:
 232  * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
 233  */
 234 #ifdef __FreeBSD__
 235 #define FS_sig(context)      ((context)->sc_fs)
 236 #define GS_sig(context)      ((context)->sc_gs)
 237 #endif
 238
 239 #ifdef linux
 240 #define FS_sig(context)      ((context)->sc_fs)
 241 #define GS_sig(context)      ((context)->sc_gs)
 242 #define CR2_sig(context)     ((context)->cr2)
 243 #define TRAP_sig(context)    ((context)->sc_trapno)
 244 #define ERROR_sig(context)   ((context)->sc_err)
 245 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 246 #endif
 247
 248 #ifndef __FreeBSD__
 249 #define EFL_sig(context)     ((context)->sc_eflags)
 250 #else
 251 #define EFL_sig(context)     ((context)->sc_efl)
 252 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 253 #define CR2_sig(context)     ((context)->sc_err)
 254 #define TRAP_sig(context)    ((context)->sc_trapno)
 255 #endif
 256
 257 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 258 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 259
 260 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 261
 262 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 263
 264 #ifdef _SCO_DS
 265 #define gregs regs
 266 #endif
 267
 268 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 269 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 270 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 271 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 272 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 273 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 274 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 275
 276 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 277 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 278 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 279 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 280
 281 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 282 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 283
 284 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 285
 286 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 287 #ifdef R_ESP
 288 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 289 #else
 290 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 291 #endif
 292 #ifdef TRAPNO
 293 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 294 #endif
 295
 296 #endif  /* svr4 || SCO_DS */
 297
 298
 299 /* exception code definitions (already defined by FreeBSD) */
 300 #ifndef __FreeBSD__  /* FIXME: other BSDs? */
 301 #define T_DIVIDE        0   /* Division by zero exception */
 302 #define T_TRCTRAP       1   /* Single-step exception */
 303 #define T_NMI           2   /* NMI interrupt */
 304 #define T_BPTFLT        3   /* Breakpoint exception */
 305 #define T_OFLOW         4   /* Overflow exception */
 306 #define T_BOUND         5   /* Bound range exception */
 307 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 308 #define T_DNA           7   /* Device not available exception */
 309 #define T_DOUBLEFLT     8   /* Double fault exception */
 310 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 311 #define T_TSSFLT        10  /* Invalid TSS exception */
 312 #define T_SEGNPFLT      11  /* Segment not present exception */
 313 #define T_STKFLT        12  /* Stack fault */
 314 #define T_PROTFLT       13  /* General protection fault */
 315 #define T_PAGEFLT       14  /* Page fault */
 316 #define T_RESERVED      15  /* Unknown exception */
 317 #define T_ARITHTRAP     16  /* Floating point exception */
 318 #define T_ALIGNFLT      17  /* Alignment check exception */
 319 #define T_MCHK          18  /* Machine check exception */
 320 #define T_CACHEFLT      19  /* Cache flush exception */
 321 #endif
 322
 323 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 324
 325 #include "wine/exception.h"
 326 #include "winnt.h"
 327 #include "stackframe.h"
 328 #include "global.h"
 329 #include "miscemu.h"
 330 #include "ntddk.h"
 331 #include "syslevel.h"
 332 #include "debugtools.h"
 333
 334 DEFAULT_DEBUG_CHANNEL(seh)
 335
 336
 337
 338 /***********************************************************************
 339  *           handler_init
 340  *
 341  * Initialization code for a signal handler.
 342  * Restores the proper %fs value for the current thread.
 343  */
 344 static inline void handler_init( CONTEXT *context, const SIGCONTEXT *sigcontext )
 345 {
 346     WORD fs;
 347     /* get %fs at time of the fault */
 348 #ifdef FS_sig
 349     fs = FS_sig(sigcontext);
 350 #else
 351     fs = __get_fs();
 352 #endif
 353     context->SegFs = fs;
 354     /* now restore a proper %fs for the fault handler */
 355     if ((EFL_sig(sigcontext) & 0x00020000) ||  /* vm86 mode */
 356         !IS_SELECTOR_SYSTEM(CS_sig(sigcontext)))  /* 16-bit mode */
 357         fs = SYSLEVEL_Win16CurrentTeb;
 358     if (!fs) fs = SYSLEVEL_EmergencyTeb;
 359     __set_fs(fs);
 360 }
 361
 362 /***********************************************************************
 363  *           get_trap_code
 364  *
 365  * Get the trap code for a signal.
 366  */
 367 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 368 {
 369 #ifdef TRAP_sig
 370     return TRAP_sig(sigcontext);
 371 #else
 372     return T_UNKNOWN;  /* unknown trap code */
 373 #endif
 374 }
 375
 376 /***********************************************************************
 377  *           get_error_code
 378  *
 379  * Get the error code for a signal.
 380  */
 381 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 382 {
 383 #ifdef ERROR_sig
 384     return ERROR_sig(sigcontext);
 385 #else
 386     return 0;
 387 #endif
 388 }
 389
 390 /***********************************************************************
 391  *           get_cr2_value
 392  *
 393  * Get the CR2 value for a signal.
 394  */
 395 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
 396 {
 397 #ifdef CR2_sig
 398     return (void *)CR2_sig(sigcontext);
 399 #else
 400     return NULL;
 401 #endif
 402 }
 403
 404 /***********************************************************************
 405  *           save_context
 406  *
 407  * Set the register values from a sigcontext.
 408  */
 409 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 410 {
 411     context->Eax    = EAX_sig(sigcontext);
 412     context->Ebx    = EBX_sig(sigcontext);
 413     context->Ecx    = ECX_sig(sigcontext);
 414     context->Edx    = EDX_sig(sigcontext);
 415     context->Esi    = ESI_sig(sigcontext);
 416     context->Edi    = EDI_sig(sigcontext);
 417     context->Ebp    = EBP_sig(sigcontext);
 418     context->EFlags = EFL_sig(sigcontext);
 419     context->Eip    = EIP_sig(sigcontext);
 420     context->Esp    = ESP_sig(sigcontext);
 421     context->SegCs  = LOWORD(CS_sig(sigcontext));
 422     context->SegDs  = LOWORD(DS_sig(sigcontext));
 423     context->SegEs  = LOWORD(ES_sig(sigcontext));
 424     context->SegSs  = LOWORD(SS_sig(sigcontext));
 425     /* %fs already handled in handler_init */
 426 #ifdef GS_sig
 427     context->SegGs  = LOWORD(GS_sig(sigcontext));
 428 #else
 429     context->SegGs  = __get_gs();
 430 #endif
 431 }
 432
 433
 434 /***********************************************************************
 435  *           restore_context
 436  *
 437  * Build a sigcontext from the register values.
 438  */
 439 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 440 {
 441     EAX_sig(sigcontext) = context->Eax;
 442     EBX_sig(sigcontext) = context->Ebx;
 443     ECX_sig(sigcontext) = context->Ecx;
 444     EDX_sig(sigcontext) = context->Edx;
 445     ESI_sig(sigcontext) = context->Esi;
 446     EDI_sig(sigcontext) = context->Edi;
 447     EBP_sig(sigcontext) = context->Ebp;
 448     EFL_sig(sigcontext) = context->EFlags;
 449     EIP_sig(sigcontext) = context->Eip;
 450     ESP_sig(sigcontext) = context->Esp;
 451     CS_sig(sigcontext)  = context->SegCs;
 452     DS_sig(sigcontext)  = context->SegDs;
 453     ES_sig(sigcontext)  = context->SegEs;
 454     SS_sig(sigcontext)  = context->SegSs;
 455 #ifdef FS_sig
 456     FS_sig(sigcontext)  = context->SegFs;
 457 #else
 458     __set_fs( context->SegFs );
 459 #endif
 460 #ifdef GS_sig
 461     GS_sig(sigcontext)  = context->SegGs;
 462 #else
 463     __set_gs( context->SegGs );
 464 #endif
 465 }
 466
 467
 468 /***********************************************************************
 469  *           save_fpu
 470  *
 471  * Set the FPU context from a sigcontext.
 472  */
 473 static void inline save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 474 {
 475 #ifdef FPU_sig
 476     if (FPU_sig(sigcontext))
 477     {
 478         context->FloatSave = *FPU_sig(sigcontext);
 479         return;
 480     }
 481 #endif  /* FPU_sig */
 482 #ifdef __GNUC__
 483     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 484 #endif  /* __GNUC__ */
 485 }
 486
 487
 488 /***********************************************************************
 489  *           restore_fpu
 490  *
 491  * Restore the FPU context to a sigcontext.
 492  */
 493 static void inline restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 494 {
 495     /* reset the current interrupt status */
 496     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 497 #ifdef FPU_sig
 498     if (FPU_sig(sigcontext))
 499     {
 500         *FPU_sig(sigcontext) = context->FloatSave;
 501         return;
 502     }
 503 #endif  /* FPU_sig */
 504 #ifdef __GNUC__
 505     /* avoid nested exceptions */
 506     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 507 #endif  /* __GNUC__ */
 508 }
 509
 510
 511 /**********************************************************************
 512  *              get_fpu_code
 513  *
 514  * Get the FPU exception code from the FPU status.
 515  */
 516 static inline DWORD get_fpu_code( const CONTEXT *context )
 517 {
 518     DWORD status = context->FloatSave.StatusWord;
 519
 520     if (status & 0x01)  /* IE */
 521     {
 522         if (status & 0x40)  /* SF */
 523             return EXCEPTION_FLT_STACK_CHECK;
 524         else
 525             return EXCEPTION_FLT_INVALID_OPERATION;
 526     }
 527     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 528     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 529     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 530     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 531     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 532     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 533 }
 534
 535
 536 /**********************************************************************
 537  *              do_segv
 538  *
 539  * Implementation of SIGSEGV handler.
 540  */
 541 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
 542 {
 543     EXCEPTION_RECORD rec;
 544     DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
 545
 546 #ifdef CR2_sig
 547     /* we want the page-fault case to be fast */
 548     if (trap_code == T_PAGEFLT)
 549         if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
 550 #endif
 551
 552     rec.ExceptionRecord  = NULL;
 553     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 554     rec.ExceptionAddress = (LPVOID)context->Eip;
 555     rec.NumberParameters = 0;
 556
 557     switch(trap_code)
 558     {
 559     case T_OFLOW:   /* Overflow exception */
 560         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 561         break;
 562     case T_BOUND:   /* Bound range exception */
 563         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 564         break;
 565     case T_PRIVINFLT:   /* Invalid opcode exception */
 566         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 567         break;
 568     case T_STKFLT:  /* Stack fault */
 569         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 570         break;
 571     case T_SEGNPFLT:  /* Segment not present exception */
 572     case T_PROTFLT:   /* General protection fault */
 573     case T_UNKNOWN:   /* Unknown fault code */
 574         if (INSTR_EmulateInstruction( context )) return;
 575         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 576         break;
 577     case T_PAGEFLT:  /* Page fault */
 578 #ifdef CR2_sig
 579         rec.NumberParameters = 2;
 580         rec.ExceptionInformation[0] = (err_code & 2) != 0;
 581         rec.ExceptionInformation[0] = 0;
 582         rec.ExceptionInformation[1] = (DWORD)cr2;
 583 #endif /* CR2_sig */
 584         rec.ExceptionCode = page_fault_code;
 585         break;
 586     case T_ALIGNFLT:  /* Alignment check exception */
 587         /* FIXME: pass through exception handler first? */
 588         if (context->EFlags & 0x00040000)
 589         {
 590             /* Disable AC flag, return */
 591             context->EFlags &= ~0x00040000;
 592             return;
 593         }
 594         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 595         break;
 596     default:
 597         ERR( "Got unexpected trap %d\n", trap_code );
 598         /* fall through */
 599     case T_NMI:       /* NMI interrupt */
 600     case T_DNA:       /* Device not available exception */
 601     case T_DOUBLEFLT: /* Double fault exception */
 602     case T_TSSFLT:    /* Invalid TSS exception */
 603     case T_RESERVED:  /* Unknown exception */
 604     case T_MCHK:      /* Machine check exception */
 605 #ifdef T_CACHEFLT
 606     case T_CACHEFLT:  /* Cache flush exception */
 607 #endif
 608         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 609         break;
 610     }
 611     EXC_RtlRaiseException( &rec, context );
 612 }
 613
 614
 615 /**********************************************************************
 616  *              do_trap
 617  *
 618  * Implementation of SIGTRAP handler.
 619  */
 620 static void do_trap( CONTEXT *context, int trap_code )
 621 {
 622     EXCEPTION_RECORD rec;
 623
 624     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 625     rec.ExceptionRecord  = NULL;
 626     rec.ExceptionAddress = (LPVOID)context->Eip;
 627     rec.NumberParameters = 0;
 628
 629     switch(trap_code)
 630     {
 631     case T_TRCTRAP:  /* Single-step exception */
 632         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 633         context->EFlags &= ~0x100;  /* clear single-step flag */
 634         break;
 635     case T_BPTFLT:   /* Breakpoint exception */
 636         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 637         /* fall through */
 638     default:
 639         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 640         break;
 641     }
 642     EXC_RtlRaiseException( &rec, context );
 643 }
 644
 645
 646 /**********************************************************************
 647  *              do_fpe
 648  *
 649  * Implementation of SIGFPE handler
 650  */
 651 static void do_fpe( CONTEXT *context, int trap_code )
 652 {
 653     EXCEPTION_RECORD rec;
 654
 655     switch(trap_code)
 656     {
 657     case T_DIVIDE:   /* Division by zero exception */
 658         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 659         break;
 660     case T_FPOPFLT:   /* Coprocessor segment overrun */
 661         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 662         break;
 663     case T_ARITHTRAP:  /* Floating point exception */
 664     case T_UNKNOWN:    /* Unknown fault code */
 665         rec.ExceptionCode = get_fpu_code( context );
 666         break;
 667     default:
 668         ERR( "Got unexpected trap %d\n", trap_code );
 669         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 670         break;
 671     }
 672     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 673     rec.ExceptionRecord  = NULL;
 674     rec.ExceptionAddress = (LPVOID)context->Eip;
 675     rec.NumberParameters = 0;
 676     EXC_RtlRaiseException( &rec, context );
 677 }
 678
 679
 680 /**********************************************************************
 681  *              segv_handler
 682  *
 683  * Handler for SIGSEGV and related errors.
 684  */
 685 static HANDLER_DEF(segv_handler)
 686 {
 687     CONTEXT context;
 688     handler_init( &context, HANDLER_CONTEXT );
 689     save_context( &context, HANDLER_CONTEXT );
 690     do_segv( &context, get_trap_code(HANDLER_CONTEXT),
 691              get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
 692     restore_context( &context, HANDLER_CONTEXT );
 693 }
 694
 695
 696 /**********************************************************************
 697  *              trap_handler
 698  *
 699  * Handler for SIGTRAP.
 700  */
 701 static HANDLER_DEF(trap_handler)
 702 {
 703     CONTEXT context;
 704     handler_init( &context, HANDLER_CONTEXT );
 705     save_context( &context, HANDLER_CONTEXT );
 706     do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
 707     restore_context( &context, HANDLER_CONTEXT );
 708 }
 709
 710
 711 /**********************************************************************
 712  *              fpe_handler
 713  *
 714  * Handler for SIGFPE.
 715  */
 716 static HANDLER_DEF(fpe_handler)
 717 {
 718     CONTEXT context;
 719     handler_init( &context, HANDLER_CONTEXT );
 720     save_fpu( &context, HANDLER_CONTEXT );
 721     save_context( &context, HANDLER_CONTEXT );
 722     do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
 723     restore_context( &context, HANDLER_CONTEXT );
 724     restore_fpu( &context, HANDLER_CONTEXT );
 725 }
 726
 727
 728 /**********************************************************************
 729  *              int_handler
 730  *
 731  * Handler for SIGINT.
 732  */
 733 static HANDLER_DEF(int_handler)
 734 {
 735     EXCEPTION_RECORD rec;
 736     CONTEXT context;
 737
 738     handler_init( &context, HANDLER_CONTEXT );
 739     save_context( &context, HANDLER_CONTEXT );
 740     rec.ExceptionCode    = CONTROL_C_EXIT;
 741     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 742     rec.ExceptionRecord  = NULL;
 743     rec.ExceptionAddress = (LPVOID)context.Eip;
 744     rec.NumberParameters = 0;
 745     EXC_RtlRaiseException( &rec, &context );
 746     restore_context( &context, HANDLER_CONTEXT );
 747 }
 748
 749
 750 /***********************************************************************
 751  *           set_handler
 752  *
 753  * Set a signal handler
 754  */
 755 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
 756 {
 757     struct sigaction sig_act;
 758
 759 #ifdef linux
 760     if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
 761     {
 762         struct kernel_sigaction sig_act;
 763         sig_act.ksa_handler = func;
 764         sig_act.ksa_flags   = SA_RESTART | SA_NOMASK;
 765         sig_act.ksa_mask    = 0;
 766         /* point to the top of the stack */
 767         sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
 768         return wine_sigaction( sig, &sig_act, NULL );
 769     }
 770 #endif  /* linux */
 771     sig_act.sa_handler = func;
 772     sigemptyset( &sig_act.sa_mask );
 773
 774 #ifdef linux
 775     sig_act.sa_flags = SA_RESTART | SA_NOMASK;
 776 #elif defined (__svr4__) || defined(_SCO_DS)
 777     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
 778 #else
 779     sig_act.sa_flags = 0;
 780 #endif
 781
 782 #ifdef SA_ONSTACK
 783     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
 784 #endif
 785     return sigaction( sig, &sig_act, NULL );
 786 }
 787
 788
 789 /**********************************************************************
 790  *              SIGNAL_Init
 791  */
 792 BOOL SIGNAL_Init(void)
 793 {
 794     int have_sigaltstack = 0;
 795
 796 #ifdef HAVE_SIGALTSTACK
 797     struct sigaltstack ss;
 798     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
 799     {
 800         ss.ss_size  = SIGNAL_STACK_SIZE;
 801         ss.ss_flags = 0;
 802         if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
 803 #ifdef linux
 804         /* sigaltstack may fail because the kernel is too old, or
 805            because glibc is brain-dead. In the latter case a
 806            direct system call should succeed. */
 807         else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
 808 #endif  /* linux */
 809     }
 810 #endif  /* HAVE_SIGALTSTACK */
 811
 812     /* automatic child reaping to avoid zombies */
 813     signal( SIGCHLD, SIG_IGN );
 814
 815     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
 816     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
 817     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
 818     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
 819 #ifdef SIGBUS
 820     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
 821 #endif
 822 #ifdef SIGTRAP
 823     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
 824 #endif
 825     return TRUE;
 826
 827  error:
 828     perror("sigaction");
 829     return FALSE;
 830 }
 831
 832
 833 #ifdef linux
 834 /**********************************************************************
 835  *              __wine_enter_vm86
 836  *
 837  * Enter vm86 mode with the specified register context.
 838  */
 839 void __wine_enter_vm86( CONTEXT *context )
 840 {
 841     EXCEPTION_RECORD rec;
 842     int res;
 843     struct vm86plus_struct vm86;
 844
 845     for (;;)
 846     {
 847         vm86.regs.eax    = context->Eax;
 848         vm86.regs.ebx    = context->Ebx;
 849         vm86.regs.ecx    = context->Ecx;
 850         vm86.regs.edx    = context->Edx;
 851         vm86.regs.esi    = context->Esi;
 852         vm86.regs.edi    = context->Edi;
 853         vm86.regs.esp    = context->Esp;
 854         vm86.regs.ebp    = context->Ebp;
 855         vm86.regs.eip    = context->Eip;
 856         vm86.regs.cs     = context->SegCs;
 857         vm86.regs.ds     = context->SegDs;
 858         vm86.regs.es     = context->SegEs;
 859         vm86.regs.fs     = context->SegFs;
 860         vm86.regs.gs     = context->SegGs;
 861         vm86.regs.eflags = context->EFlags;
 862         if (vm86.regs.eflags & IF_MASK) vm86.regs.eflags |= VIF_MASK;
 863
 864         res = wine_vm86plus( VM86_ENTER, &vm86 );
 865
 866         context->Eax    = vm86.regs.eax;
 867         context->Ebx    = vm86.regs.ebx;
 868         context->Ecx    = vm86.regs.ecx;
 869         context->Edx    = vm86.regs.edx;
 870         context->Esi    = vm86.regs.esi;
 871         context->Edi    = vm86.regs.edi;
 872         context->Esp    = vm86.regs.esp;
 873         context->Ebp    = vm86.regs.ebp;
 874         context->Eip    = vm86.regs.eip;
 875         context->SegCs  = vm86.regs.cs;
 876         context->SegDs  = vm86.regs.ds;
 877         context->SegEs  = vm86.regs.es;
 878         context->SegFs  = vm86.regs.fs;
 879         context->SegGs  = vm86.regs.gs;
 880         context->EFlags = vm86.regs.eflags;
 881
 882         switch(VM86_TYPE(res))
 883         {
 884         case VM86_SIGNAL: /* return due to signal */
 885             switch(VM86_ARG(res))
 886             {
 887             case SIGILL:
 888             case SIGSEGV:
 889 #ifdef SIGBUS
 890             case SIGBUS:
 891 #endif
 892                 do_segv( context, T_UNKNOWN, 0, 0 );
 893                 continue;
 894             case SIGTRAP:
 895                 do_trap( context, T_UNKNOWN  );
 896                 continue;
 897             case SIGFPE:
 898                 do_fpe( context, T_UNKNOWN );
 899                 continue;
 900             }
 901             rec.ExceptionCode = EXCEPTION_VM86_SIGNAL;
 902             break;
 903         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
 904             do_segv( context, T_PROTFLT, 0, 0 );
 905             continue;
 906         case VM86_TRAP: /* return due to DOS-debugger request */
 907             do_trap( context, T_UNKNOWN  );
 908             continue;
 909         case VM86_INTx: /* int3/int x instruction (ARG = x) */
 910             rec.ExceptionCode = EXCEPTION_VM86_INTx;
 911             break;
 912         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
 913             rec.ExceptionCode = EXCEPTION_VM86_STI;
 914             break;
 915         case VM86_PICRETURN: /* return due to pending PIC request */
 916             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
 917             break;
 918         default:
 919             ERR( "unhandled result from vm86 mode %x\n", res );
 920             continue;
 921         }
 922         rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
 923         rec.ExceptionRecord         = NULL;
 924         rec.ExceptionAddress        = (LPVOID)context->Eip;
 925         rec.NumberParameters        = 1;
 926         rec.ExceptionInformation[0] = VM86_ARG(res);
 927         EXC_RtlRaiseException( &rec, context );
 928     }
 929 }
 930
 931 #else /* linux */
 932 void __wine_enter_vm86( CONTEXT *context )
 933 {
 934     MESSAGE("vm86 mode not supported on this platform\n");
 935 }
 936 #endif /* linux */
 937
 938 /**********************************************************************
 939  *              DbgBreakPoint   (NTDLL)
 940  */
 941 void WINAPI DbgBreakPoint(void);
 942 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
 943
 944 /**********************************************************************
 945  *              DbgUserBreakPoint   (NTDLL)
 946  */
 947 void WINAPI DbgUserBreakPoint(void);
 948 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
 949
 950 #endif  /* __i386__ */