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 <unistd.h>
  15
  16 #ifdef HAVE_SYS_PARAM_H
  17 # include <sys/param.h>
  18 #endif
  19 #ifdef HAVE_SYSCALL_H
  20 # include <syscall.h>
  21 #else
  22 # ifdef HAVE_SYS_SYSCALL_H
  23 #  include <sys/syscall.h>
  24 # endif
  25 #endif
  26
  27 /***********************************************************************
  28  * signal context platform-specific definitions
  29  */
  30
  31 #ifdef linux
  32 typedef struct
  33 {
  34     unsigned short sc_gs, __gsh;
  35     unsigned short sc_fs, __fsh;
  36     unsigned short sc_es, __esh;
  37     unsigned short sc_ds, __dsh;
  38     unsigned long sc_edi;
  39     unsigned long sc_esi;
  40     unsigned long sc_ebp;
  41     unsigned long sc_esp;
  42     unsigned long sc_ebx;
  43     unsigned long sc_edx;
  44     unsigned long sc_ecx;
  45     unsigned long sc_eax;
  46     unsigned long sc_trapno;
  47     unsigned long sc_err;
  48     unsigned long sc_eip;
  49     unsigned short sc_cs, __csh;
  50     unsigned long sc_eflags;
  51     unsigned long esp_at_signal;
  52     unsigned short sc_ss, __ssh;
  53     unsigned long i387;
  54     unsigned long oldmask;
  55     unsigned long cr2;
  56 } SIGCONTEXT;
  57
  58 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
  59 #define HANDLER_CONTEXT (&__context)
  60
  61 /* this is the sigaction structure from the Linux 2.1.20 kernel.  */
  62 #undef sa_handler
  63 struct kernel_sigaction
  64 {
  65     void (*sa_handler)();
  66     unsigned long sa_mask;
  67     unsigned long sa_flags;
  68     void *sa_restorer;
  69 };
  70
  71 /* Similar to the sigaction function in libc, except it leaves alone the
  72    restorer field, which is used to specify the signal stack address */
  73 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
  74                                   struct kernel_sigaction *old )
  75 {
  76     __asm__ __volatile__( "pushl %%ebx\n\t"
  77                           "movl %2,%%ebx\n\t"
  78                           "int $0x80\n\t"
  79                           "popl %%ebx"
  80                           : "=a" (sig)
  81                           : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
  82     if (sig>=0) return 0;
  83     errno = -sig;
  84     return -1;
  85 }
  86
  87 #endif  /* linux */
  88
  89 #ifdef BSDI
  90
  91 #define EAX_sig(context)     ((context)->tf_eax)
  92 #define EBX_sig(context)     ((context)->tf_ebx)
  93 #define ECX_sig(context)     ((context)->tf_ecx)
  94 #define EDX_sig(context)     ((context)->tf_edx)
  95 #define ESI_sig(context)     ((context)->tf_esi)
  96 #define EDI_sig(context)     ((context)->tf_edi)
  97 #define EBP_sig(context)     ((context)->tf_ebp)
  98
  99 #define CS_sig(context)      ((context)->tf_cs)
 100 #define DS_sig(context)      ((context)->tf_ds)
 101 #define ES_sig(context)      ((context)->tf_es)
 102 #define SS_sig(context)      ((context)->tf_ss)
 103
 104 #include <machine/frame.h>
 105 typedef struct trapframe SIGCONTEXT;
 106
 107 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 108 #define HANDLER_CONTEXT __context
 109
 110 #define EFL_sig(context)     ((context)->tf_eflags)
 111
 112 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 113 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 114
 115 #endif /* bsdi */
 116
 117 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 118
 119 #include <signal.h>
 120 typedef struct sigcontext SIGCONTEXT;
 121
 122 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 123 #define HANDLER_CONTEXT __context
 124
 125 #endif  /* FreeBSD */
 126
 127 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 128
 129 #include <signal.h>
 130 #ifdef _SCO_DS
 131 #include <sys/regset.h>
 132 #endif
 133 /* Solaris kludge */
 134 #undef ERR
 135 #include <sys/ucontext.h>
 136 #undef ERR
 137 typedef struct ucontext SIGCONTEXT;
 138
 139 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
 140 #define HANDLER_CONTEXT __context
 141
 142 #endif  /* svr4 || SCO_DS */
 143
 144 #ifdef __EMX__
 145
 146 typedef struct
 147 {
 148     unsigned long ContextFlags;
 149     FLOATING_SAVE_AREA sc_float;
 150     unsigned long sc_gs;
 151     unsigned long sc_fs;
 152     unsigned long sc_es;
 153     unsigned long sc_ds;
 154     unsigned long sc_edi;
 155     unsigned long sc_esi;
 156     unsigned long sc_eax;
 157     unsigned long sc_ebx;
 158     unsigned long sc_ecx;
 159     unsigned long sc_edx;
 160     unsigned long sc_ebp;
 161     unsigned long sc_eip;
 162     unsigned long sc_cs;
 163     unsigned long sc_eflags;
 164     unsigned long sc_esp;
 165     unsigned long sc_ss;
 166 } SIGCONTEXT;
 167
 168 #endif  /* __EMX__ */
 169
 170
 171 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__EMX__)
 172
 173 #define EAX_sig(context)     ((context)->sc_eax)
 174 #define EBX_sig(context)     ((context)->sc_ebx)
 175 #define ECX_sig(context)     ((context)->sc_ecx)
 176 #define EDX_sig(context)     ((context)->sc_edx)
 177 #define ESI_sig(context)     ((context)->sc_esi)
 178 #define EDI_sig(context)     ((context)->sc_edi)
 179 #define EBP_sig(context)     ((context)->sc_ebp)
 180
 181 #define CS_sig(context)      ((context)->sc_cs)
 182 #define DS_sig(context)      ((context)->sc_ds)
 183 #define ES_sig(context)      ((context)->sc_es)
 184 #define SS_sig(context)      ((context)->sc_ss)
 185
 186 #ifdef linux
 187 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
 188  * saved by the exception handling. duh.
 189  */
 190 #define FS_sig(context)      ((context)->sc_fs)
 191 #define GS_sig(context)      ((context)->sc_gs)
 192 #define CR2_sig(context)     ((context)->cr2)
 193 #define TRAP_sig(context)    ((context)->sc_trapno)
 194 #define ERROR_sig(context)   ((context)->sc_err)
 195 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 196 #endif
 197
 198 #ifndef __FreeBSD__
 199 #define EFL_sig(context)     ((context)->sc_eflags)
 200 #else
 201 #define EFL_sig(context)     ((context)->sc_efl)
 202 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 203 #define CR2_sig(context)     ((context)->sc_err)
 204 #define TRAP_sig(context)    ((context)->sc_trapno)
 205 #endif
 206
 207 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 208 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 209
 210 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 211
 212 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 213
 214 #ifdef _SCO_DS
 215 #define gregs regs
 216 #endif
 217
 218 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 219 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 220 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 221 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 222 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 223 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 224 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 225
 226 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 227 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 228 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 229 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 230
 231 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 232 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 233
 234 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 235
 236 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 237 #ifdef R_ESP
 238 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 239 #else
 240 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 241 #endif
 242 #ifdef TRAPNO
 243 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 244 #endif
 245
 246 #endif  /* svr4 || SCO_DS */
 247
 248
 249 /* exception code definitions (already defined by FreeBSD) */
 250 #ifndef __FreeBSD__  /* FIXME: other BSDs? */
 251 #define T_DIVIDE        0   /* Division by zero exception */
 252 #define T_TRCTRAP       1   /* Single-step exception */
 253 #define T_NMI           2   /* NMI interrupt */
 254 #define T_BPTFLT        3   /* Breakpoint exception */
 255 #define T_OFLOW         4   /* Overflow exception */
 256 #define T_BOUND         5   /* Bound range exception */
 257 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 258 #define T_DNA           7   /* Device not available exception */
 259 #define T_DOUBLEFLT     8   /* Double fault exception */
 260 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 261 #define T_TSSFLT        10  /* Invalid TSS exception */
 262 #define T_SEGNPFLT      11  /* Segment not present exception */
 263 #define T_STKFLT        12  /* Stack fault */
 264 #define T_PROTFLT       13  /* General protection fault */
 265 #define T_PAGEFLT       14  /* Page fault */
 266 #define T_RESERVED      15  /* Unknown exception */
 267 #define T_ARITHTRAP     16  /* Floating point exception */
 268 #define T_ALIGNFLT      17  /* Alignment check exception */
 269 #define T_MCHK          18  /* Machine check exception */
 270 #define T_CACHEFLT      19  /* Cache flush exception */
 271 #endif
 272
 273 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 274
 275 #include "winnt.h"
 276 #include "stackframe.h"
 277 #include "global.h"
 278 #include "miscemu.h"
 279 #include "ntddk.h"
 280 #include "syslevel.h"
 281 #include "debugtools.h"
 282
 283 DEFAULT_DEBUG_CHANNEL(seh)
 284
 285
 286 extern void WINAPI REGS_FUNC(RtlRaiseException)( EXCEPTION_RECORD *rec, CONTEXT *context );
 287
 288
 289 /***********************************************************************
 290  *           handler_init
 291  *
 292  * Initialization code for a signal handler.
 293  * Restores the proper %fs value for the current thread.
 294  */
 295 static inline void handler_init( CONTEXT *context, const SIGCONTEXT *sigcontext )
 296 {
 297     WORD fs;
 298     /* get %fs at time of the fault */
 299 #ifdef FS_sig
 300     fs = FS_sig(sigcontext);
 301 #else
 302     GET_FS(fs);
 303 #endif
 304     context->SegFs = fs;
 305     /* now restore a proper %fs for the fault handler */
 306     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext))) fs = SYSLEVEL_Win16CurrentTeb;
 307     if (!fs) fs = SYSLEVEL_EmergencyTeb;
 308     SET_FS(fs);
 309 }
 310
 311 /***********************************************************************
 312  *           get_trap_code
 313  *
 314  * Get the trap code for a signal.
 315  */
 316 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 317 {
 318 #ifdef TRAP_sig
 319     return TRAP_sig(sigcontext);
 320 #else
 321     return T_UNKNOWN;  /* unknown trap code */
 322 #endif
 323 }
 324
 325 /***********************************************************************
 326  *           save_context
 327  *
 328  * Set the register values from a sigcontext.
 329  */
 330 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 331 {
 332     context->Eax    = EAX_sig(sigcontext);
 333     context->Ebx    = EBX_sig(sigcontext);
 334     context->Ecx    = ECX_sig(sigcontext);
 335     context->Edx    = EDX_sig(sigcontext);
 336     context->Esi    = ESI_sig(sigcontext);
 337     context->Edi    = EDI_sig(sigcontext);
 338     context->Ebp    = EBP_sig(sigcontext);
 339     context->EFlags = EFL_sig(sigcontext);
 340     context->Eip    = EIP_sig(sigcontext);
 341     context->Esp    = ESP_sig(sigcontext);
 342     context->SegCs  = LOWORD(CS_sig(sigcontext));
 343     context->SegDs  = LOWORD(DS_sig(sigcontext));
 344     context->SegEs  = LOWORD(ES_sig(sigcontext));
 345     context->SegSs  = LOWORD(SS_sig(sigcontext));
 346     /* %fs already handled in handler_init */
 347 #ifdef GS_sig
 348     context->SegGs  = LOWORD(GS_sig(sigcontext));
 349 #else
 350     GET_GS( context->SegGs );
 351     context->SegGs &= 0xffff;
 352 #endif
 353     if (ISV86(context)) V86BASE(context) = (DWORD)DOSMEM_MemoryBase(0);
 354 }
 355
 356
 357 /***********************************************************************
 358  *           restore_context
 359  *
 360  * Build a sigcontext from the register values.
 361  */
 362 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 363 {
 364     EAX_sig(sigcontext) = context->Eax;
 365     EBX_sig(sigcontext) = context->Ebx;
 366     ECX_sig(sigcontext) = context->Ecx;
 367     EDX_sig(sigcontext) = context->Edx;
 368     ESI_sig(sigcontext) = context->Esi;
 369     EDI_sig(sigcontext) = context->Edi;
 370     EBP_sig(sigcontext) = context->Ebp;
 371     EFL_sig(sigcontext) = context->EFlags;
 372     EIP_sig(sigcontext) = context->Eip;
 373     ESP_sig(sigcontext) = context->Esp;
 374     CS_sig(sigcontext)  = context->SegCs;
 375     DS_sig(sigcontext)  = context->SegDs;
 376     ES_sig(sigcontext)  = context->SegEs;
 377     SS_sig(sigcontext)  = context->SegSs;
 378 #ifdef FS_sig
 379     FS_sig(sigcontext)  = context->SegFs;
 380 #else
 381     SET_FS( context->SegFs );
 382 #endif
 383 #ifdef GS_sig
 384     GS_sig(sigcontext)  = context->SegGs;
 385 #else
 386     SET_GS( context->SegGs );
 387 #endif
 388 }
 389
 390
 391 /***********************************************************************
 392  *           save_fpu
 393  *
 394  * Set the FPU context from a sigcontext.
 395  */
 396 static void inline save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 397 {
 398 #ifdef FPU_sig
 399     if (FPU_sig(sigcontext))
 400     {
 401         context->FloatSave = *FPU_sig(sigcontext);
 402         return;
 403     }
 404 #endif  /* FPU_sig */
 405 #ifdef __GNUC__
 406     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 407 #endif  /* __GNUC__ */
 408 }
 409
 410
 411 /***********************************************************************
 412  *           restore_fpu
 413  *
 414  * Restore the FPU context to a sigcontext.
 415  */
 416 static void inline restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 417 {
 418 #ifdef FPU_sig
 419     if (FPU_sig(sigcontext))
 420     {
 421         *FPU_sig(sigcontext) = context->FloatSave;
 422         return;
 423     }
 424 #endif  /* FPU_sig */
 425 #ifdef __GNUC__
 426     /* avoid nested exceptions */
 427     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 428     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 429 #endif  /* __GNUC__ */
 430 }
 431
 432
 433 /**********************************************************************
 434  *              get_fpu_code
 435  *
 436  * Get the FPU exception code from the FPU status.
 437  */
 438 static inline DWORD get_fpu_code( const CONTEXT *context )
 439 {
 440     DWORD status = context->FloatSave.StatusWord;
 441
 442     if (status & 0x01)  /* IE */
 443     {
 444         if (status & 0x40)  /* SF */
 445             return EXCEPTION_FLT_STACK_CHECK;
 446         else
 447             return EXCEPTION_FLT_INVALID_OPERATION;
 448     }
 449     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 450     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 451     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 452     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 453     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 454     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 455 }
 456
 457
 458 /**********************************************************************
 459  *              segv_handler
 460  *
 461  * Handler for SIGSEGV and related errors.
 462  */
 463 static HANDLER_DEF(segv_handler)
 464 {
 465     EXCEPTION_RECORD rec;
 466     CONTEXT context;
 467
 468     handler_init( &context, HANDLER_CONTEXT );
 469
 470 #ifdef CR2_sig
 471     /* we want the page-fault case to be fast */
 472     if (get_trap_code(HANDLER_CONTEXT) == T_PAGEFLT)
 473         if (VIRTUAL_HandleFault( (LPVOID)CR2_sig(HANDLER_CONTEXT) )) return;
 474 #endif
 475
 476     save_context( &context, HANDLER_CONTEXT );
 477     rec.ExceptionRecord  = NULL;
 478     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 479     rec.ExceptionAddress = (LPVOID)context.Eip;
 480     rec.NumberParameters = 0;
 481
 482     switch(get_trap_code(HANDLER_CONTEXT))
 483     {
 484     case T_OFLOW:   /* Overflow exception */
 485         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 486         break;
 487     case T_BOUND:   /* Bound range exception */
 488         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 489         break;
 490     case T_PRIVINFLT:   /* Invalid opcode exception */
 491         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 492         break;
 493     case T_STKFLT:  /* Stack fault */
 494         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 495         break;
 496     case T_SEGNPFLT:  /* Segment not present exception */
 497     case T_PROTFLT:   /* General protection fault */
 498     case T_UNKNOWN:   /* Unknown fault code */
 499         if (INSTR_EmulateInstruction( &context )) goto restore;
 500         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 501         break;
 502     case T_PAGEFLT:  /* Page fault */
 503 #ifdef CR2_sig
 504         rec.NumberParameters = 2;
 505 #ifdef ERROR_sig
 506         rec.ExceptionInformation[0] = (ERROR_sig(HANDLER_CONTEXT) & 2) != 0;
 507 #else
 508         rec.ExceptionInformation[0] = 0;
 509 #endif /* ERROR_sig */
 510         rec.ExceptionInformation[1] = CR2_sig(HANDLER_CONTEXT);
 511 #endif /* CR2_sig */
 512         rec.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
 513         break;
 514     case T_ALIGNFLT:  /* Alignment check exception */
 515         /* FIXME: pass through exception handler first? */
 516         if (context.EFlags & 0x00040000)
 517         {
 518             /* Disable AC flag, return */
 519             context.EFlags &= ~0x00040000;
 520             goto restore;
 521         }
 522         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 523         break;
 524     default:
 525         ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
 526         /* fall through */
 527     case T_NMI:       /* NMI interrupt */
 528     case T_DNA:       /* Device not available exception */
 529     case T_DOUBLEFLT: /* Double fault exception */
 530     case T_TSSFLT:    /* Invalid TSS exception */
 531     case T_RESERVED:  /* Unknown exception */
 532     case T_MCHK:      /* Machine check exception */
 533 #ifdef T_CACHEFLT
 534     case T_CACHEFLT:  /* Cache flush exception */
 535 #endif
 536         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 537         break;
 538     }
 539
 540     REGS_FUNC(RtlRaiseException)( &rec, &context );
 541  restore:
 542     restore_context( &context, HANDLER_CONTEXT );
 543 }
 544
 545
 546 /**********************************************************************
 547  *              trap_handler
 548  *
 549  * Handler for SIGTRAP.
 550  */
 551 static HANDLER_DEF(trap_handler)
 552 {
 553     EXCEPTION_RECORD rec;
 554     CONTEXT context;
 555
 556     handler_init( &context, HANDLER_CONTEXT );
 557
 558     switch(get_trap_code(HANDLER_CONTEXT))
 559     {
 560     case T_TRCTRAP:  /* Single-step exception */
 561         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 562         break;
 563     case T_BPTFLT:   /* Breakpoint exception */
 564     default:
 565         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 566         break;
 567     }
 568     save_context( &context, HANDLER_CONTEXT );
 569     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 570     rec.ExceptionRecord  = NULL;
 571     rec.ExceptionAddress = (LPVOID)context.Eip;
 572     rec.NumberParameters = 0;
 573     REGS_FUNC(RtlRaiseException)( &rec, &context );
 574     restore_context( &context, HANDLER_CONTEXT );
 575 }
 576
 577
 578 /**********************************************************************
 579  *              fpe_handler
 580  *
 581  * Handler for SIGFPE.
 582  */
 583 static HANDLER_DEF(fpe_handler)
 584 {
 585     EXCEPTION_RECORD rec;
 586     CONTEXT context;
 587
 588     handler_init( &context, HANDLER_CONTEXT );
 589
 590     save_fpu( &context, HANDLER_CONTEXT );
 591
 592     switch(get_trap_code(HANDLER_CONTEXT))
 593     {
 594     case T_DIVIDE:   /* Division by zero exception */
 595         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 596         break;
 597     case T_FPOPFLT:   /* Coprocessor segment overrun */
 598         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 599         break;
 600     case T_ARITHTRAP:  /* Floating point exception */
 601     case T_UNKNOWN:    /* Unknown fault code */
 602         rec.ExceptionCode = get_fpu_code( &context );
 603         break;
 604     default:
 605         ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
 606         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 607         break;
 608     }
 609     save_context( &context, HANDLER_CONTEXT );
 610     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 611     rec.ExceptionRecord  = NULL;
 612     rec.ExceptionAddress = (LPVOID)context.Eip;
 613     rec.NumberParameters = 0;
 614     REGS_FUNC(RtlRaiseException)( &rec, &context );
 615     restore_context( &context, HANDLER_CONTEXT );
 616     restore_fpu( &context, HANDLER_CONTEXT );
 617 }
 618
 619
 620 /**********************************************************************
 621  *              int_handler
 622  *
 623  * Handler for SIGINT.
 624  */
 625 static HANDLER_DEF(int_handler)
 626 {
 627     EXCEPTION_RECORD rec;
 628     CONTEXT context;
 629
 630     handler_init( &context, HANDLER_CONTEXT );
 631     save_context( &context, HANDLER_CONTEXT );
 632     rec.ExceptionCode    = CONTROL_C_EXIT;
 633     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 634     rec.ExceptionRecord  = NULL;
 635     rec.ExceptionAddress = (LPVOID)context.Eip;
 636     rec.NumberParameters = 0;
 637     REGS_FUNC(RtlRaiseException)( &rec, &context );
 638     restore_context( &context, HANDLER_CONTEXT );
 639 }
 640
 641
 642 /***********************************************************************
 643  *           set_handler
 644  *
 645  * Set a signal handler
 646  */
 647 static int set_handler( int sig, void (*func)() )
 648 {
 649 #ifdef linux
 650     struct kernel_sigaction sig_act;
 651     sig_act.sa_handler = func;
 652     sig_act.sa_flags   = SA_RESTART | SA_NOMASK;
 653     sig_act.sa_mask    = 0;
 654     /* point to the top of the stack */
 655     sig_act.sa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
 656     return wine_sigaction( sig, &sig_act, NULL );
 657 #else  /* linux */
 658     struct sigaction sig_act;
 659     sig_act.sa_handler = func;
 660     sigemptyset( &sig_act.sa_mask );
 661
 662 # if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 663     sig_act.sa_flags = SA_ONSTACK;
 664 # elif defined (__svr4__) || defined(_SCO_DS)
 665     sig_act.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART;
 666 # elif defined(__EMX__)
 667     sig_act.sa_flags = 0; /* FIXME: EMX has only SA_ACK and SA_SYSV */
 668 # else
 669     sig_act.sa_flags = 0;
 670 # endif
 671     return sigaction( sig, &sig_act, NULL );
 672 #endif  /* linux */
 673 }
 674
 675
 676 /**********************************************************************
 677  *              SIGNAL_Init
 678  */
 679 BOOL SIGNAL_Init(void)
 680 {
 681 #ifdef HAVE_WORKING_SIGALTSTACK
 682     struct sigaltstack ss;
 683     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
 684     {
 685         ss.ss_size  = SIGNAL_STACK_SIZE;
 686         ss.ss_flags = 0;
 687         if (sigaltstack(&ss, NULL) < 0)
 688         {
 689             perror("sigaltstack");
 690             /* fall through on error and try it differently */
 691         }
 692     }
 693 #endif  /* HAVE_SIGALTSTACK */
 694
 695     /* ignore SIGPIPE so that WINSOCK can get a EPIPE error instead  */
 696     signal( SIGPIPE, SIG_IGN );
 697     /* automatic child reaping to avoid zombies */
 698     signal( SIGCHLD, SIG_IGN );
 699
 700     if (set_handler( SIGINT,  (void (*)())int_handler ) == -1) goto error;
 701     if (set_handler( SIGFPE,  (void (*)())fpe_handler ) == -1) goto error;
 702     if (set_handler( SIGSEGV, (void (*)())segv_handler ) == -1) goto error;
 703     if (set_handler( SIGILL,  (void (*)())segv_handler ) == -1) goto error;
 704 #ifdef SIGBUS
 705     if (set_handler( SIGBUS,  (void (*)())segv_handler ) == -1) goto error;
 706 #endif
 707 #ifdef SIGTRAP
 708     if (set_handler( SIGTRAP, (void (*)())trap_handler ) == -1) goto error;
 709 #endif
 710     return TRUE;
 711
 712  error:
 713     perror("sigaction");
 714     return FALSE;
 715 }
 716
 717 #endif  /* __i386__ */