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 #ifdef HAVE_SYS_SIGNAL_H
  33 # include <sys/signal.h>
  34 #endif
  35
  36 #include "winnt.h"
  37 #include "selectors.h"
  38
  39 /***********************************************************************
  40  * signal context platform-specific definitions
  41  */
  42
  43 #ifdef linux
  44 typedef struct
  45 {
  46     unsigned short sc_gs, __gsh;
  47     unsigned short sc_fs, __fsh;
  48     unsigned short sc_es, __esh;
  49     unsigned short sc_ds, __dsh;
  50     unsigned long sc_edi;
  51     unsigned long sc_esi;
  52     unsigned long sc_ebp;
  53     unsigned long sc_esp;
  54     unsigned long sc_ebx;
  55     unsigned long sc_edx;
  56     unsigned long sc_ecx;
  57     unsigned long sc_eax;
  58     unsigned long sc_trapno;
  59     unsigned long sc_err;
  60     unsigned long sc_eip;
  61     unsigned short sc_cs, __csh;
  62     unsigned long sc_eflags;
  63     unsigned long esp_at_signal;
  64     unsigned short sc_ss, __ssh;
  65     unsigned long i387;
  66     unsigned long oldmask;
  67     unsigned long cr2;
  68 } SIGCONTEXT;
  69
  70 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
  71 #define HANDLER_CONTEXT (&__context)
  72
  73 /* this is the sigaction structure from the Linux 2.1.20 kernel.  */
  74 struct kernel_sigaction
  75 {
  76     void (*ksa_handler)();
  77     unsigned long ksa_mask;
  78     unsigned long ksa_flags;
  79     void *ksa_restorer;
  80 };
  81
  82 /* Similar to the sigaction function in libc, except it leaves alone the
  83    restorer field, which is used to specify the signal stack address */
  84 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
  85                                   struct kernel_sigaction *old )
  86 {
  87     __asm__ __volatile__( "pushl %%ebx\n\t"
  88                           "movl %2,%%ebx\n\t"
  89                           "int $0x80\n\t"
  90                           "popl %%ebx"
  91                           : "=a" (sig)
  92                           : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
  93     if (sig>=0) return 0;
  94     errno = -sig;
  95     return -1;
  96 }
  97
  98 #ifdef HAVE_SIGALTSTACK
  99 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
 100 static inline int wine_sigaltstack( const struct sigaltstack *new,
 101                                     struct sigaltstack *old )
 102 {
 103     int ret;
 104     __asm__ __volatile__( "pushl %%ebx\n\t"
 105                           "movl %2,%%ebx\n\t"
 106                           "int $0x80\n\t"
 107                           "popl %%ebx"
 108                           : "=a" (ret)
 109                           : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
 110     if (ret >= 0) return 0;
 111     errno = -ret;
 112     return -1;
 113 }
 114 #endif
 115
 116 int vm86_enter( struct vm86plus_struct *ptr );
 117 void vm86_return();
 118 __ASM_GLOBAL_FUNC(vm86_enter,
 119                   "pushl %ebp\n\t"
 120                   "movl %esp, %ebp\n\t"
 121                   "movl $166,%eax\n\t"  /*SYS_vm86*/
 122                   "movl 8(%ebp),%ecx\n\t"
 123                   "pushl %ebx\n\t"
 124                   "movl $1,%ebx\n\t"    /*VM86_ENTER*/
 125                   "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
 126                   "pushl %fs\n\t"
 127                   "int $0x80\n"
 128                   ".globl " __ASM_NAME("vm86_return") "\n\t"
 129                   ".type " __ASM_NAME("vm86_return") ",@function\n"
 130                   __ASM_NAME("vm86_return") ":\n\t"
 131                   "popl %fs\n\t"
 132                   "popl %ecx\n\t"
 133                   "popl %ebx\n\t"
 134                   "popl %ebp\n\t"
 135                   "ret" );
 136
 137 #endif  /* linux */
 138
 139 #ifdef BSDI
 140
 141 #define EAX_sig(context)     ((context)->tf_eax)
 142 #define EBX_sig(context)     ((context)->tf_ebx)
 143 #define ECX_sig(context)     ((context)->tf_ecx)
 144 #define EDX_sig(context)     ((context)->tf_edx)
 145 #define ESI_sig(context)     ((context)->tf_esi)
 146 #define EDI_sig(context)     ((context)->tf_edi)
 147 #define EBP_sig(context)     ((context)->tf_ebp)
 148
 149 #define CS_sig(context)      ((context)->tf_cs)
 150 #define DS_sig(context)      ((context)->tf_ds)
 151 #define ES_sig(context)      ((context)->tf_es)
 152 #define SS_sig(context)      ((context)->tf_ss)
 153
 154 #include <machine/frame.h>
 155 typedef struct trapframe SIGCONTEXT;
 156
 157 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 158 #define HANDLER_CONTEXT __context
 159
 160 #define EFL_sig(context)     ((context)->tf_eflags)
 161
 162 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 163 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 164
 165 #endif /* bsdi */
 166
 167 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 168
 169 typedef struct sigcontext SIGCONTEXT;
 170
 171 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 172 #define HANDLER_CONTEXT __context
 173
 174 #endif  /* FreeBSD */
 175
 176 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 177
 178 #ifdef _SCO_DS
 179 #include <sys/regset.h>
 180 #endif
 181 /* Solaris kludge */
 182 #undef ERR
 183 #include <sys/ucontext.h>
 184 #undef ERR
 185 typedef struct ucontext SIGCONTEXT;
 186
 187 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
 188 #define HANDLER_CONTEXT __context
 189
 190 #endif  /* svr4 || SCO_DS */
 191
 192 #ifdef __EMX__
 193
 194 typedef struct
 195 {
 196     unsigned long ContextFlags;
 197     FLOATING_SAVE_AREA sc_float;
 198     unsigned long sc_gs;
 199     unsigned long sc_fs;
 200     unsigned long sc_es;
 201     unsigned long sc_ds;
 202     unsigned long sc_edi;
 203     unsigned long sc_esi;
 204     unsigned long sc_eax;
 205     unsigned long sc_ebx;
 206     unsigned long sc_ecx;
 207     unsigned long sc_edx;
 208     unsigned long sc_ebp;
 209     unsigned long sc_eip;
 210     unsigned long sc_cs;
 211     unsigned long sc_eflags;
 212     unsigned long sc_esp;
 213     unsigned long sc_ss;
 214 } SIGCONTEXT;
 215
 216 #endif  /* __EMX__ */
 217
 218
 219 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__EMX__)
 220
 221 #define EAX_sig(context)     ((context)->sc_eax)
 222 #define EBX_sig(context)     ((context)->sc_ebx)
 223 #define ECX_sig(context)     ((context)->sc_ecx)
 224 #define EDX_sig(context)     ((context)->sc_edx)
 225 #define ESI_sig(context)     ((context)->sc_esi)
 226 #define EDI_sig(context)     ((context)->sc_edi)
 227 #define EBP_sig(context)     ((context)->sc_ebp)
 228
 229 #define CS_sig(context)      ((context)->sc_cs)
 230 #define DS_sig(context)      ((context)->sc_ds)
 231 #define ES_sig(context)      ((context)->sc_es)
 232 #define SS_sig(context)      ((context)->sc_ss)
 233
 234 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
 235  * saved by the exception handling. duh.
 236  * Actually they are in -current (have been for a while), and that
 237  * patch now finally has been MFC'd to -stable too (Nov 15 1999).
 238  * If you're running a system from the -stable branch older than that,
 239  * like a 3.3-RELEASE, grab the patch from the ports tree:
 240  * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
 241  * (If its not yet there when you look, go here:
 242  * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
 243  */
 244 #ifdef __FreeBSD__
 245 #define FS_sig(context)      ((context)->sc_fs)
 246 #define GS_sig(context)      ((context)->sc_gs)
 247 #endif
 248
 249 #ifdef linux
 250 #define FS_sig(context)      ((context)->sc_fs)
 251 #define GS_sig(context)      ((context)->sc_gs)
 252 #define CR2_sig(context)     ((context)->cr2)
 253 #define TRAP_sig(context)    ((context)->sc_trapno)
 254 #define ERROR_sig(context)   ((context)->sc_err)
 255 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 256 #endif
 257
 258 #ifndef __FreeBSD__
 259 #define EFL_sig(context)     ((context)->sc_eflags)
 260 #else
 261 #define EFL_sig(context)     ((context)->sc_efl)
 262 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 263 #define CR2_sig(context)     ((context)->sc_err)
 264 #define TRAP_sig(context)    ((context)->sc_trapno)
 265 #endif
 266
 267 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 268 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 269
 270 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 271
 272 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 273
 274 #ifdef _SCO_DS
 275 #define gregs regs
 276 #endif
 277
 278 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 279 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 280 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 281 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 282 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 283 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 284 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 285
 286 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 287 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 288 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 289 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 290
 291 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 292 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 293
 294 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 295
 296 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 297 #ifdef R_ESP
 298 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 299 #else
 300 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 301 #endif
 302 #ifdef TRAPNO
 303 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 304 #endif
 305
 306 #endif  /* svr4 || SCO_DS */
 307
 308
 309 /* exception code definitions (already defined by FreeBSD) */
 310 #ifndef __FreeBSD__  /* FIXME: other BSDs? */
 311 #define T_DIVIDE        0   /* Division by zero exception */
 312 #define T_TRCTRAP       1   /* Single-step exception */
 313 #define T_NMI           2   /* NMI interrupt */
 314 #define T_BPTFLT        3   /* Breakpoint exception */
 315 #define T_OFLOW         4   /* Overflow exception */
 316 #define T_BOUND         5   /* Bound range exception */
 317 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 318 #define T_DNA           7   /* Device not available exception */
 319 #define T_DOUBLEFLT     8   /* Double fault exception */
 320 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 321 #define T_TSSFLT        10  /* Invalid TSS exception */
 322 #define T_SEGNPFLT      11  /* Segment not present exception */
 323 #define T_STKFLT        12  /* Stack fault */
 324 #define T_PROTFLT       13  /* General protection fault */
 325 #define T_PAGEFLT       14  /* Page fault */
 326 #define T_RESERVED      15  /* Unknown exception */
 327 #define T_ARITHTRAP     16  /* Floating point exception */
 328 #define T_ALIGNFLT      17  /* Alignment check exception */
 329 #define T_MCHK          18  /* Machine check exception */
 330 #define T_CACHEFLT      19  /* Cache flush exception */
 331 #endif
 332
 333 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 334
 335 #include "wine/exception.h"
 336 #include "winnt.h"
 337 #include "stackframe.h"
 338 #include "global.h"
 339 #include "miscemu.h"
 340 #include "ntddk.h"
 341 #include "syslevel.h"
 342 #include "debugtools.h"
 343
 344 DEFAULT_DEBUG_CHANNEL(seh);
 345
 346
 347 /***********************************************************************
 348  *           get_trap_code
 349  *
 350  * Get the trap code for a signal.
 351  */
 352 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 353 {
 354 #ifdef TRAP_sig
 355     return TRAP_sig(sigcontext);
 356 #else
 357     return T_UNKNOWN;  /* unknown trap code */
 358 #endif
 359 }
 360
 361 /***********************************************************************
 362  *           get_error_code
 363  *
 364  * Get the error code for a signal.
 365  */
 366 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 367 {
 368 #ifdef ERROR_sig
 369     return ERROR_sig(sigcontext);
 370 #else
 371     return 0;
 372 #endif
 373 }
 374
 375 /***********************************************************************
 376  *           get_cr2_value
 377  *
 378  * Get the CR2 value for a signal.
 379  */
 380 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
 381 {
 382 #ifdef CR2_sig
 383     return (void *)CR2_sig(sigcontext);
 384 #else
 385     return NULL;
 386 #endif
 387 }
 388
 389
 390 #ifdef linux
 391 /***********************************************************************
 392  *           save_vm86_context
 393  *
 394  * Set the register values from a vm86 structure.
 395  */
 396 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 397 {
 398     context->Eax    = vm86->regs.eax;
 399     context->Ebx    = vm86->regs.ebx;
 400     context->Ecx    = vm86->regs.ecx;
 401     context->Edx    = vm86->regs.edx;
 402     context->Esi    = vm86->regs.esi;
 403     context->Edi    = vm86->regs.edi;
 404     context->Esp    = vm86->regs.esp;
 405     context->Ebp    = vm86->regs.ebp;
 406     context->Eip    = vm86->regs.eip;
 407     context->SegCs  = vm86->regs.cs;
 408     context->SegDs  = vm86->regs.ds;
 409     context->SegEs  = vm86->regs.es;
 410     context->SegFs  = vm86->regs.fs;
 411     context->SegGs  = vm86->regs.gs;
 412     context->SegSs  = vm86->regs.ss;
 413     context->EFlags = vm86->regs.eflags;
 414 }
 415
 416
 417 /***********************************************************************
 418  *           restore_vm86_context
 419  *
 420  * Build a vm86 structure from the register values.
 421  */
 422 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 423 {
 424     vm86->regs.eax    = context->Eax;
 425     vm86->regs.ebx    = context->Ebx;
 426     vm86->regs.ecx    = context->Ecx;
 427     vm86->regs.edx    = context->Edx;
 428     vm86->regs.esi    = context->Esi;
 429     vm86->regs.edi    = context->Edi;
 430     vm86->regs.esp    = context->Esp;
 431     vm86->regs.ebp    = context->Ebp;
 432     vm86->regs.eip    = context->Eip;
 433     vm86->regs.cs     = context->SegCs;
 434     vm86->regs.ds     = context->SegDs;
 435     vm86->regs.es     = context->SegEs;
 436     vm86->regs.fs     = context->SegFs;
 437     vm86->regs.gs     = context->SegGs;
 438     vm86->regs.ss     = context->SegSs;
 439     vm86->regs.eflags = context->EFlags;
 440 }
 441 #endif /* linux */
 442
 443
 444 /***********************************************************************
 445  *           save_context
 446  *
 447  * Set the register values from a sigcontext.
 448  */
 449 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 450 {
 451     WORD fs;
 452     /* get %fs at time of the fault */
 453 #ifdef FS_sig
 454     fs = FS_sig(sigcontext);
 455 #else
 456     fs = __get_fs();
 457 #endif
 458     context->SegFs = fs;
 459
 460     /* now restore a proper %fs for the fault handler */
 461     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)))  /* 16-bit mode */
 462     {
 463         fs = SYSLEVEL_Win16CurrentTeb;
 464     }
 465 #ifdef linux
 466     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 467     {
 468         /* retrieve pointer to vm86plus struct that was stored in vm86_enter */
 469         struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
 470         /* fetch the saved %fs on the stack */
 471         fs = *(unsigned int *)ESP_sig(sigcontext);
 472         __set_fs(fs);
 473         /* get context from vm86 struct */
 474         save_vm86_context( context, vm86 );
 475         return;
 476     }
 477 #endif  /* linux */
 478
 479     __set_fs(fs);
 480
 481     context->Eax    = EAX_sig(sigcontext);
 482     context->Ebx    = EBX_sig(sigcontext);
 483     context->Ecx    = ECX_sig(sigcontext);
 484     context->Edx    = EDX_sig(sigcontext);
 485     context->Esi    = ESI_sig(sigcontext);
 486     context->Edi    = EDI_sig(sigcontext);
 487     context->Ebp    = EBP_sig(sigcontext);
 488     context->EFlags = EFL_sig(sigcontext);
 489     context->Eip    = EIP_sig(sigcontext);
 490     context->Esp    = ESP_sig(sigcontext);
 491     context->SegCs  = LOWORD(CS_sig(sigcontext));
 492     context->SegDs  = LOWORD(DS_sig(sigcontext));
 493     context->SegEs  = LOWORD(ES_sig(sigcontext));
 494     context->SegSs  = LOWORD(SS_sig(sigcontext));
 495 #ifdef GS_sig
 496     context->SegGs  = LOWORD(GS_sig(sigcontext));
 497 #else
 498     context->SegGs  = __get_gs();
 499 #endif
 500 }
 501
 502
 503 /***********************************************************************
 504  *           restore_context
 505  *
 506  * Build a sigcontext from the register values.
 507  */
 508 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 509 {
 510 #ifdef linux
 511     /* check if exception occurred in vm86 mode */
 512     if ((void *)EIP_sig(sigcontext) == vm86_return &&
 513         IS_SELECTOR_SYSTEM(CS_sig(sigcontext)))
 514     {
 515         /* retrieve pointer to vm86plus struct that was stored in vm86_enter */
 516         struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
 517         restore_vm86_context( context, vm86 );
 518         return;
 519     }
 520 #endif /* linux */
 521
 522     EAX_sig(sigcontext) = context->Eax;
 523     EBX_sig(sigcontext) = context->Ebx;
 524     ECX_sig(sigcontext) = context->Ecx;
 525     EDX_sig(sigcontext) = context->Edx;
 526     ESI_sig(sigcontext) = context->Esi;
 527     EDI_sig(sigcontext) = context->Edi;
 528     EBP_sig(sigcontext) = context->Ebp;
 529     EFL_sig(sigcontext) = context->EFlags;
 530     EIP_sig(sigcontext) = context->Eip;
 531     ESP_sig(sigcontext) = context->Esp;
 532     CS_sig(sigcontext)  = context->SegCs;
 533     DS_sig(sigcontext)  = context->SegDs;
 534     ES_sig(sigcontext)  = context->SegEs;
 535     SS_sig(sigcontext)  = context->SegSs;
 536 #ifdef FS_sig
 537     FS_sig(sigcontext)  = context->SegFs;
 538 #else
 539     __set_fs( context->SegFs );
 540 #endif
 541 #ifdef GS_sig
 542     GS_sig(sigcontext)  = context->SegGs;
 543 #else
 544     __set_gs( context->SegGs );
 545 #endif
 546 }
 547
 548
 549 /***********************************************************************
 550  *           save_fpu
 551  *
 552  * Set the FPU context from a sigcontext.
 553  */
 554 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 555 {
 556 #ifdef FPU_sig
 557     if (FPU_sig(sigcontext))
 558     {
 559         context->FloatSave = *FPU_sig(sigcontext);
 560         return;
 561     }
 562 #endif  /* FPU_sig */
 563 #ifdef __GNUC__
 564     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 565 #endif  /* __GNUC__ */
 566 }
 567
 568
 569 /***********************************************************************
 570  *           restore_fpu
 571  *
 572  * Restore the FPU context to a sigcontext.
 573  */
 574 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 575 {
 576     /* reset the current interrupt status */
 577     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 578 #ifdef FPU_sig
 579     if (FPU_sig(sigcontext))
 580     {
 581         *FPU_sig(sigcontext) = context->FloatSave;
 582         return;
 583     }
 584 #endif  /* FPU_sig */
 585 #ifdef __GNUC__
 586     /* avoid nested exceptions */
 587     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 588 #endif  /* __GNUC__ */
 589 }
 590
 591
 592 /**********************************************************************
 593  *              get_fpu_code
 594  *
 595  * Get the FPU exception code from the FPU status.
 596  */
 597 static inline DWORD get_fpu_code( const CONTEXT *context )
 598 {
 599     DWORD status = context->FloatSave.StatusWord;
 600
 601     if (status & 0x01)  /* IE */
 602     {
 603         if (status & 0x40)  /* SF */
 604             return EXCEPTION_FLT_STACK_CHECK;
 605         else
 606             return EXCEPTION_FLT_INVALID_OPERATION;
 607     }
 608     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 609     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 610     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 611     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 612     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 613     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 614 }
 615
 616
 617 /**********************************************************************
 618  *              do_segv
 619  *
 620  * Implementation of SIGSEGV handler.
 621  */
 622 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
 623 {
 624     EXCEPTION_RECORD rec;
 625     DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
 626
 627 #ifdef CR2_sig
 628     /* we want the page-fault case to be fast */
 629     if (trap_code == T_PAGEFLT)
 630         if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
 631 #endif
 632
 633     rec.ExceptionRecord  = NULL;
 634     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 635     rec.ExceptionAddress = (LPVOID)context->Eip;
 636     rec.NumberParameters = 0;
 637
 638     switch(trap_code)
 639     {
 640     case T_OFLOW:   /* Overflow exception */
 641         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 642         break;
 643     case T_BOUND:   /* Bound range exception */
 644         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 645         break;
 646     case T_PRIVINFLT:   /* Invalid opcode exception */
 647         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 648         break;
 649     case T_STKFLT:  /* Stack fault */
 650         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 651         break;
 652     case T_SEGNPFLT:  /* Segment not present exception */
 653     case T_PROTFLT:   /* General protection fault */
 654     case T_UNKNOWN:   /* Unknown fault code */
 655         if (INSTR_EmulateInstruction( context )) return;
 656         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 657         break;
 658     case T_PAGEFLT:  /* Page fault */
 659 #ifdef CR2_sig
 660         rec.NumberParameters = 2;
 661         rec.ExceptionInformation[0] = (err_code & 2) != 0;
 662         rec.ExceptionInformation[1] = (DWORD)cr2;
 663 #endif /* CR2_sig */
 664         rec.ExceptionCode = page_fault_code;
 665         break;
 666     case T_ALIGNFLT:  /* Alignment check exception */
 667         /* FIXME: pass through exception handler first? */
 668         if (context->EFlags & 0x00040000)
 669         {
 670             /* Disable AC flag, return */
 671             context->EFlags &= ~0x00040000;
 672             return;
 673         }
 674         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 675         break;
 676     default:
 677         ERR( "Got unexpected trap %d\n", trap_code );
 678         /* fall through */
 679     case T_NMI:       /* NMI interrupt */
 680     case T_DNA:       /* Device not available exception */
 681     case T_DOUBLEFLT: /* Double fault exception */
 682     case T_TSSFLT:    /* Invalid TSS exception */
 683     case T_RESERVED:  /* Unknown exception */
 684     case T_MCHK:      /* Machine check exception */
 685 #ifdef T_CACHEFLT
 686     case T_CACHEFLT:  /* Cache flush exception */
 687 #endif
 688         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 689         break;
 690     }
 691     EXC_RtlRaiseException( &rec, context );
 692 }
 693
 694
 695 /**********************************************************************
 696  *              do_trap
 697  *
 698  * Implementation of SIGTRAP handler.
 699  */
 700 static void do_trap( CONTEXT *context, int trap_code )
 701 {
 702     EXCEPTION_RECORD rec;
 703
 704     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 705     rec.ExceptionRecord  = NULL;
 706     rec.ExceptionAddress = (LPVOID)context->Eip;
 707     rec.NumberParameters = 0;
 708
 709     switch(trap_code)
 710     {
 711     case T_TRCTRAP:  /* Single-step exception */
 712         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 713         context->EFlags &= ~0x100;  /* clear single-step flag */
 714         break;
 715     case T_BPTFLT:   /* Breakpoint exception */
 716         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 717         /* fall through */
 718     default:
 719         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 720         break;
 721     }
 722     EXC_RtlRaiseException( &rec, context );
 723 }
 724
 725
 726 /**********************************************************************
 727  *              do_fpe
 728  *
 729  * Implementation of SIGFPE handler
 730  */
 731 static void do_fpe( CONTEXT *context, int trap_code )
 732 {
 733     EXCEPTION_RECORD rec;
 734
 735     switch(trap_code)
 736     {
 737     case T_DIVIDE:   /* Division by zero exception */
 738         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 739         break;
 740     case T_FPOPFLT:   /* Coprocessor segment overrun */
 741         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 742         break;
 743     case T_ARITHTRAP:  /* Floating point exception */
 744     case T_UNKNOWN:    /* Unknown fault code */
 745         rec.ExceptionCode = get_fpu_code( context );
 746         break;
 747     default:
 748         ERR( "Got unexpected trap %d\n", trap_code );
 749         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 750         break;
 751     }
 752     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 753     rec.ExceptionRecord  = NULL;
 754     rec.ExceptionAddress = (LPVOID)context->Eip;
 755     rec.NumberParameters = 0;
 756     EXC_RtlRaiseException( &rec, context );
 757 }
 758
 759
 760 /**********************************************************************
 761  *              segv_handler
 762  *
 763  * Handler for SIGSEGV and related errors.
 764  */
 765 static HANDLER_DEF(segv_handler)
 766 {
 767     CONTEXT context;
 768     save_context( &context, HANDLER_CONTEXT );
 769     do_segv( &context, get_trap_code(HANDLER_CONTEXT),
 770              get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
 771     restore_context( &context, HANDLER_CONTEXT );
 772 }
 773
 774
 775 /**********************************************************************
 776  *              trap_handler
 777  *
 778  * Handler for SIGTRAP.
 779  */
 780 static HANDLER_DEF(trap_handler)
 781 {
 782     CONTEXT context;
 783     save_context( &context, HANDLER_CONTEXT );
 784     do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
 785     restore_context( &context, HANDLER_CONTEXT );
 786 }
 787
 788
 789 /**********************************************************************
 790  *              fpe_handler
 791  *
 792  * Handler for SIGFPE.
 793  */
 794 static HANDLER_DEF(fpe_handler)
 795 {
 796     CONTEXT context;
 797     save_fpu( &context, HANDLER_CONTEXT );
 798     save_context( &context, HANDLER_CONTEXT );
 799     do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
 800     restore_context( &context, HANDLER_CONTEXT );
 801     restore_fpu( &context, HANDLER_CONTEXT );
 802 }
 803
 804
 805 /**********************************************************************
 806  *              int_handler
 807  *
 808  * Handler for SIGINT.
 809  */
 810 static HANDLER_DEF(int_handler)
 811 {
 812     EXCEPTION_RECORD rec;
 813     CONTEXT context;
 814
 815     save_context( &context, HANDLER_CONTEXT );
 816     rec.ExceptionCode    = CONTROL_C_EXIT;
 817     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 818     rec.ExceptionRecord  = NULL;
 819     rec.ExceptionAddress = (LPVOID)context.Eip;
 820     rec.NumberParameters = 0;
 821     EXC_RtlRaiseException( &rec, &context );
 822     restore_context( &context, HANDLER_CONTEXT );
 823 }
 824
 825
 826 /***********************************************************************
 827  *           set_handler
 828  *
 829  * Set a signal handler
 830  */
 831 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
 832 {
 833     struct sigaction sig_act;
 834
 835 #ifdef linux
 836     if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
 837     {
 838         struct kernel_sigaction sig_act;
 839         sig_act.ksa_handler = func;
 840         sig_act.ksa_flags   = SA_RESTART | SA_NOMASK;
 841         sig_act.ksa_mask    = 0;
 842         /* point to the top of the stack */
 843         sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
 844         return wine_sigaction( sig, &sig_act, NULL );
 845     }
 846 #endif  /* linux */
 847     sig_act.sa_handler = func;
 848     sigemptyset( &sig_act.sa_mask );
 849
 850 #ifdef linux
 851     sig_act.sa_flags = SA_RESTART | SA_NOMASK;
 852 #elif defined (__svr4__) || defined(_SCO_DS)
 853     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
 854 #else
 855     sig_act.sa_flags = 0;
 856 #endif
 857
 858 #ifdef SA_ONSTACK
 859     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
 860 #endif
 861     return sigaction( sig, &sig_act, NULL );
 862 }
 863
 864
 865 /**********************************************************************
 866  *              SIGNAL_Init
 867  */
 868 BOOL SIGNAL_Init(void)
 869 {
 870     int have_sigaltstack = 0;
 871
 872 #ifdef HAVE_SIGALTSTACK
 873     struct sigaltstack ss;
 874     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
 875     {
 876         ss.ss_size  = SIGNAL_STACK_SIZE;
 877         ss.ss_flags = 0;
 878         if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
 879 #ifdef linux
 880         /* sigaltstack may fail because the kernel is too old, or
 881            because glibc is brain-dead. In the latter case a
 882            direct system call should succeed. */
 883         else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
 884 #endif  /* linux */
 885     }
 886 #endif  /* HAVE_SIGALTSTACK */
 887
 888     /* automatic child reaping to avoid zombies */
 889     signal( SIGCHLD, SIG_IGN );
 890
 891     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
 892     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
 893     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
 894     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
 895 #ifdef SIGBUS
 896     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
 897 #endif
 898 #ifdef SIGTRAP
 899     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
 900 #endif
 901     return TRUE;
 902
 903  error:
 904     perror("sigaction");
 905     return FALSE;
 906 }
 907
 908
 909 #ifdef linux
 910 /**********************************************************************
 911  *              __wine_enter_vm86
 912  *
 913  * Enter vm86 mode with the specified register context.
 914  */
 915 void __wine_enter_vm86( CONTEXT *context )
 916 {
 917     EXCEPTION_RECORD rec;
 918     int res;
 919     struct vm86plus_struct vm86;
 920
 921     memset( &vm86, 0, sizeof(vm86) );
 922     for (;;)
 923     {
 924         restore_vm86_context( context, &vm86 );
 925
 926         do
 927         {
 928             res = vm86_enter( &vm86 );
 929             if (res < 0)
 930             {
 931                 errno = -res;
 932                 return;
 933             }
 934         } while (VM86_TYPE(res) == VM86_SIGNAL);
 935
 936         save_vm86_context( context, &vm86 );
 937
 938         switch(VM86_TYPE(res))
 939         {
 940         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
 941             do_segv( context, T_PROTFLT, 0, 0 );
 942             continue;
 943         case VM86_TRAP: /* return due to DOS-debugger request */
 944             do_trap( context, VM86_ARG(res)  );
 945             continue;
 946         case VM86_INTx: /* int3/int x instruction (ARG = x) */
 947             rec.ExceptionCode = EXCEPTION_VM86_INTx;
 948             break;
 949         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
 950             rec.ExceptionCode = EXCEPTION_VM86_STI;
 951             break;
 952         case VM86_PICRETURN: /* return due to pending PIC request */
 953             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
 954             break;
 955         default:
 956             ERR( "unhandled result from vm86 mode %x\n", res );
 957             continue;
 958         }
 959         rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
 960         rec.ExceptionRecord         = NULL;
 961         rec.ExceptionAddress        = (LPVOID)context->Eip;
 962         rec.NumberParameters        = 1;
 963         rec.ExceptionInformation[0] = VM86_ARG(res);
 964         EXC_RtlRaiseException( &rec, context );
 965     }
 966 }
 967
 968 #else /* linux */
 969 void __wine_enter_vm86( CONTEXT *context )
 970 {
 971     MESSAGE("vm86 mode not supported on this platform\n");
 972 }
 973 #endif /* linux */
 974
 975 /**********************************************************************
 976  *              DbgBreakPoint   (NTDLL)
 977  */
 978 void WINAPI DbgBreakPoint(void);
 979 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
 980
 981 /**********************************************************************
 982  *              DbgUserBreakPoint   (NTDLL)
 983  */
 984 void WINAPI DbgUserBreakPoint(void);
 985 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
 986
 987 #endif  /* __i386__ */