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 "ntddk.h"
  37 #include "winnt.h"
  38
  39 #include "selectors.h"
  40
  41 /***********************************************************************
  42  * signal context platform-specific definitions
  43  */
  44
  45 #ifdef linux
  46 typedef struct
  47 {
  48     unsigned short sc_gs, __gsh;
  49     unsigned short sc_fs, __fsh;
  50     unsigned short sc_es, __esh;
  51     unsigned short sc_ds, __dsh;
  52     unsigned long sc_edi;
  53     unsigned long sc_esi;
  54     unsigned long sc_ebp;
  55     unsigned long sc_esp;
  56     unsigned long sc_ebx;
  57     unsigned long sc_edx;
  58     unsigned long sc_ecx;
  59     unsigned long sc_eax;
  60     unsigned long sc_trapno;
  61     unsigned long sc_err;
  62     unsigned long sc_eip;
  63     unsigned short sc_cs, __csh;
  64     unsigned long sc_eflags;
  65     unsigned long esp_at_signal;
  66     unsigned short sc_ss, __ssh;
  67     unsigned long i387;
  68     unsigned long oldmask;
  69     unsigned long cr2;
  70 } SIGCONTEXT;
  71
  72 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
  73 #define HANDLER_CONTEXT (&__context)
  74
  75 /* this is the sigaction structure from the Linux 2.1.20 kernel.  */
  76 struct kernel_sigaction
  77 {
  78     void (*ksa_handler)();
  79     unsigned long ksa_mask;
  80     unsigned long ksa_flags;
  81     void *ksa_restorer;
  82 };
  83
  84 /* Similar to the sigaction function in libc, except it leaves alone the
  85    restorer field, which is used to specify the signal stack address */
  86 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
  87                                   struct kernel_sigaction *old )
  88 {
  89     __asm__ __volatile__( "pushl %%ebx\n\t"
  90                           "movl %2,%%ebx\n\t"
  91                           "int $0x80\n\t"
  92                           "popl %%ebx"
  93                           : "=a" (sig)
  94                           : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
  95     if (sig>=0) return 0;
  96     errno = -sig;
  97     return -1;
  98 }
  99
 100 #ifdef HAVE_SIGALTSTACK
 101 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
 102 static inline int wine_sigaltstack( const struct sigaltstack *new,
 103                                     struct sigaltstack *old )
 104 {
 105     int ret;
 106     __asm__ __volatile__( "pushl %%ebx\n\t"
 107                           "movl %2,%%ebx\n\t"
 108                           "int $0x80\n\t"
 109                           "popl %%ebx"
 110                           : "=a" (ret)
 111                           : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
 112     if (ret >= 0) return 0;
 113     errno = -ret;
 114     return -1;
 115 }
 116 #endif
 117
 118 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
 119
 120 int vm86_enter( void **vm86_ptr );
 121 void vm86_return(void);
 122 void vm86_return_end(void);
 123 __ASM_GLOBAL_FUNC(vm86_enter,
 124                   "pushl %ebp\n\t"
 125                   "movl %esp, %ebp\n\t"
 126                   "movl $166,%eax\n\t"  /*SYS_vm86*/
 127                   "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
 128                   "movl (%ecx),%ecx\n\t"
 129                   "pushl %ebx\n\t"
 130                   "movl $1,%ebx\n\t"    /*VM86_ENTER*/
 131                   "pushl %ecx\n\t"      /* put vm86plus_struct ptr somewhere we can find it */
 132                   "pushl %fs\n\t"
 133                   "int $0x80\n"
 134                   ".globl " __ASM_NAME("vm86_return") "\n\t"
 135                   ".type " __ASM_NAME("vm86_return") ",@function\n"
 136                   __ASM_NAME("vm86_return") ":\n\t"
 137                   "popl %fs\n\t"
 138                   "popl %ecx\n\t"
 139                   "popl %ebx\n\t"
 140                   "popl %ebp\n\t"
 141                   "testl %eax,%eax\n\t"
 142                   "jl 0f\n\t"
 143                   "cmpb $0,%al\n\t" /* VM86_SIGNAL */
 144                   "je " __ASM_NAME("vm86_enter") "\n\t"
 145                   "0:\n\t"
 146                   "movl 4(%esp),%ecx\n\t"  /* vm86_ptr */
 147                   "movl $0,(%ecx)\n\t"
 148                   ".globl " __ASM_NAME("vm86_return_end") "\n\t"
 149                   ".type " __ASM_NAME("vm86_return_end") ",@function\n"
 150                   __ASM_NAME("vm86_return_end") ":\n\t"
 151                   "ret" );
 152
 153 #define __HAVE_VM86
 154
 155 #endif  /* linux */
 156
 157 #ifdef BSDI
 158
 159 #define EAX_sig(context)     ((context)->tf_eax)
 160 #define EBX_sig(context)     ((context)->tf_ebx)
 161 #define ECX_sig(context)     ((context)->tf_ecx)
 162 #define EDX_sig(context)     ((context)->tf_edx)
 163 #define ESI_sig(context)     ((context)->tf_esi)
 164 #define EDI_sig(context)     ((context)->tf_edi)
 165 #define EBP_sig(context)     ((context)->tf_ebp)
 166
 167 #define CS_sig(context)      ((context)->tf_cs)
 168 #define DS_sig(context)      ((context)->tf_ds)
 169 #define ES_sig(context)      ((context)->tf_es)
 170 #define SS_sig(context)      ((context)->tf_ss)
 171
 172 #include <machine/frame.h>
 173 typedef struct trapframe SIGCONTEXT;
 174
 175 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 176 #define HANDLER_CONTEXT __context
 177
 178 #define EFL_sig(context)     ((context)->tf_eflags)
 179
 180 #define EIP_sig(context)     (*((unsigned long*)&(context)->tf_eip))
 181 #define ESP_sig(context)     (*((unsigned long*)&(context)->tf_esp))
 182
 183 #endif /* bsdi */
 184
 185 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 186
 187 typedef struct sigcontext SIGCONTEXT;
 188
 189 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
 190 #define HANDLER_CONTEXT __context
 191
 192 #endif  /* FreeBSD */
 193
 194 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 195
 196 #ifdef _SCO_DS
 197 #include <sys/regset.h>
 198 #endif
 199 /* Solaris kludge */
 200 #undef ERR
 201 #include <sys/ucontext.h>
 202 #undef ERR
 203 typedef struct ucontext SIGCONTEXT;
 204
 205 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
 206 #define HANDLER_CONTEXT __context
 207
 208 #endif  /* svr4 || SCO_DS */
 209
 210 #ifdef __EMX__
 211
 212 typedef struct
 213 {
 214     unsigned long ContextFlags;
 215     FLOATING_SAVE_AREA sc_float;
 216     unsigned long sc_gs;
 217     unsigned long sc_fs;
 218     unsigned long sc_es;
 219     unsigned long sc_ds;
 220     unsigned long sc_edi;
 221     unsigned long sc_esi;
 222     unsigned long sc_eax;
 223     unsigned long sc_ebx;
 224     unsigned long sc_ecx;
 225     unsigned long sc_edx;
 226     unsigned long sc_ebp;
 227     unsigned long sc_eip;
 228     unsigned long sc_cs;
 229     unsigned long sc_eflags;
 230     unsigned long sc_esp;
 231     unsigned long sc_ss;
 232 } SIGCONTEXT;
 233
 234 #endif  /* __EMX__ */
 235
 236
 237 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__EMX__)
 238
 239 #define EAX_sig(context)     ((context)->sc_eax)
 240 #define EBX_sig(context)     ((context)->sc_ebx)
 241 #define ECX_sig(context)     ((context)->sc_ecx)
 242 #define EDX_sig(context)     ((context)->sc_edx)
 243 #define ESI_sig(context)     ((context)->sc_esi)
 244 #define EDI_sig(context)     ((context)->sc_edi)
 245 #define EBP_sig(context)     ((context)->sc_ebp)
 246
 247 #define CS_sig(context)      ((context)->sc_cs)
 248 #define DS_sig(context)      ((context)->sc_ds)
 249 #define ES_sig(context)      ((context)->sc_es)
 250 #define SS_sig(context)      ((context)->sc_ss)
 251
 252 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
 253  * saved by the exception handling. duh.
 254  * Actually they are in -current (have been for a while), and that
 255  * patch now finally has been MFC'd to -stable too (Nov 15 1999).
 256  * If you're running a system from the -stable branch older than that,
 257  * like a 3.3-RELEASE, grab the patch from the ports tree:
 258  * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
 259  * (If its not yet there when you look, go here:
 260  * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
 261  */
 262 #ifdef __FreeBSD__
 263 #define FS_sig(context)      ((context)->sc_fs)
 264 #define GS_sig(context)      ((context)->sc_gs)
 265 #endif
 266
 267 #ifdef linux
 268 #define FS_sig(context)      ((context)->sc_fs)
 269 #define GS_sig(context)      ((context)->sc_gs)
 270 #define CR2_sig(context)     ((context)->cr2)
 271 #define TRAP_sig(context)    ((context)->sc_trapno)
 272 #define ERROR_sig(context)   ((context)->sc_err)
 273 #define FPU_sig(context)     ((FLOATING_SAVE_AREA*)((context)->i387))
 274 #endif
 275
 276 #ifndef __FreeBSD__
 277 #define EFL_sig(context)     ((context)->sc_eflags)
 278 #else
 279 #define EFL_sig(context)     ((context)->sc_efl)
 280 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge  */
 281 #define CR2_sig(context)     ((context)->sc_err)
 282 #define TRAP_sig(context)    ((context)->sc_trapno)
 283 #endif
 284
 285 #define EIP_sig(context)     (*((unsigned long*)&(context)->sc_eip))
 286 #define ESP_sig(context)     (*((unsigned long*)&(context)->sc_esp))
 287
 288 #endif  /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
 289
 290 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
 291
 292 #ifdef _SCO_DS
 293 #define gregs regs
 294 #endif
 295
 296 #define EAX_sig(context)     ((context)->uc_mcontext.gregs[EAX])
 297 #define EBX_sig(context)     ((context)->uc_mcontext.gregs[EBX])
 298 #define ECX_sig(context)     ((context)->uc_mcontext.gregs[ECX])
 299 #define EDX_sig(context)     ((context)->uc_mcontext.gregs[EDX])
 300 #define ESI_sig(context)     ((context)->uc_mcontext.gregs[ESI])
 301 #define EDI_sig(context)     ((context)->uc_mcontext.gregs[EDI])
 302 #define EBP_sig(context)     ((context)->uc_mcontext.gregs[EBP])
 303
 304 #define CS_sig(context)      ((context)->uc_mcontext.gregs[CS])
 305 #define DS_sig(context)      ((context)->uc_mcontext.gregs[DS])
 306 #define ES_sig(context)      ((context)->uc_mcontext.gregs[ES])
 307 #define SS_sig(context)      ((context)->uc_mcontext.gregs[SS])
 308
 309 #define FS_sig(context)      ((context)->uc_mcontext.gregs[FS])
 310 #define GS_sig(context)      ((context)->uc_mcontext.gregs[GS])
 311
 312 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[EFL])
 313
 314 #define EIP_sig(context)     ((context)->uc_mcontext.gregs[EIP])
 315 #ifdef R_ESP
 316 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[R_ESP])
 317 #else
 318 #define ESP_sig(context)     ((context)->uc_mcontext.gregs[ESP])
 319 #endif
 320 #ifdef TRAPNO
 321 #define TRAP_sig(context)     ((context)->uc_mcontext.gregs[TRAPNO])
 322 #endif
 323
 324 #endif  /* svr4 || SCO_DS */
 325
 326
 327 /* exception code definitions (already defined by FreeBSD/NetBSD) */
 328 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
 329 #define T_DIVIDE        0   /* Division by zero exception */
 330 #define T_TRCTRAP       1   /* Single-step exception */
 331 #define T_NMI           2   /* NMI interrupt */
 332 #define T_BPTFLT        3   /* Breakpoint exception */
 333 #define T_OFLOW         4   /* Overflow exception */
 334 #define T_BOUND         5   /* Bound range exception */
 335 #define T_PRIVINFLT     6   /* Invalid opcode exception */
 336 #define T_DNA           7   /* Device not available exception */
 337 #define T_DOUBLEFLT     8   /* Double fault exception */
 338 #define T_FPOPFLT       9   /* Coprocessor segment overrun */
 339 #define T_TSSFLT        10  /* Invalid TSS exception */
 340 #define T_SEGNPFLT      11  /* Segment not present exception */
 341 #define T_STKFLT        12  /* Stack fault */
 342 #define T_PROTFLT       13  /* General protection fault */
 343 #define T_PAGEFLT       14  /* Page fault */
 344 #define T_RESERVED      15  /* Unknown exception */
 345 #define T_ARITHTRAP     16  /* Floating point exception */
 346 #define T_ALIGNFLT      17  /* Alignment check exception */
 347 #define T_MCHK          18  /* Machine check exception */
 348 #define T_CACHEFLT      19  /* Cache flush exception */
 349 #endif
 350 #if defined(__NetBSD__)
 351 #define T_MCHK          19  /* Machine check exception */
 352 #endif
 353
 354 #define T_UNKNOWN     (-1)  /* Unknown fault (TRAP_sig not defined) */
 355
 356 #include "wine/exception.h"
 357 #include "winnt.h"
 358 #include "stackframe.h"
 359 #include "global.h"
 360 #include "miscemu.h"
 361 #include "ntddk.h"
 362 #include "syslevel.h"
 363 #include "debugtools.h"
 364
 365 DEFAULT_DEBUG_CHANNEL(seh);
 366
 367 static sigset_t all_sigs;
 368
 369
 370 /***********************************************************************
 371  *           get_trap_code
 372  *
 373  * Get the trap code for a signal.
 374  */
 375 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
 376 {
 377 #ifdef TRAP_sig
 378     return TRAP_sig(sigcontext);
 379 #else
 380     return T_UNKNOWN;  /* unknown trap code */
 381 #endif
 382 }
 383
 384 /***********************************************************************
 385  *           get_error_code
 386  *
 387  * Get the error code for a signal.
 388  */
 389 static inline int get_error_code( const SIGCONTEXT *sigcontext )
 390 {
 391 #ifdef ERROR_sig
 392     return ERROR_sig(sigcontext);
 393 #else
 394     return 0;
 395 #endif
 396 }
 397
 398 /***********************************************************************
 399  *           get_cr2_value
 400  *
 401  * Get the CR2 value for a signal.
 402  */
 403 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
 404 {
 405 #ifdef CR2_sig
 406     return (void *)CR2_sig(sigcontext);
 407 #else
 408     return NULL;
 409 #endif
 410 }
 411
 412
 413 #ifdef __HAVE_VM86
 414 /***********************************************************************
 415  *           save_vm86_context
 416  *
 417  * Set the register values from a vm86 structure.
 418  */
 419 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
 420 {
 421     context->Eax    = vm86->regs.eax;
 422     context->Ebx    = vm86->regs.ebx;
 423     context->Ecx    = vm86->regs.ecx;
 424     context->Edx    = vm86->regs.edx;
 425     context->Esi    = vm86->regs.esi;
 426     context->Edi    = vm86->regs.edi;
 427     context->Esp    = vm86->regs.esp;
 428     context->Ebp    = vm86->regs.ebp;
 429     context->Eip    = vm86->regs.eip;
 430     context->SegCs  = vm86->regs.cs;
 431     context->SegDs  = vm86->regs.ds;
 432     context->SegEs  = vm86->regs.es;
 433     context->SegFs  = vm86->regs.fs;
 434     context->SegGs  = vm86->regs.gs;
 435     context->SegSs  = vm86->regs.ss;
 436     context->EFlags = vm86->regs.eflags;
 437 }
 438
 439
 440 /***********************************************************************
 441  *           restore_vm86_context
 442  *
 443  * Build a vm86 structure from the register values.
 444  */
 445 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
 446 {
 447     vm86->regs.eax    = context->Eax;
 448     vm86->regs.ebx    = context->Ebx;
 449     vm86->regs.ecx    = context->Ecx;
 450     vm86->regs.edx    = context->Edx;
 451     vm86->regs.esi    = context->Esi;
 452     vm86->regs.edi    = context->Edi;
 453     vm86->regs.esp    = context->Esp;
 454     vm86->regs.ebp    = context->Ebp;
 455     vm86->regs.eip    = context->Eip;
 456     vm86->regs.cs     = context->SegCs;
 457     vm86->regs.ds     = context->SegDs;
 458     vm86->regs.es     = context->SegEs;
 459     vm86->regs.fs     = context->SegFs;
 460     vm86->regs.gs     = context->SegGs;
 461     vm86->regs.ss     = context->SegSs;
 462     vm86->regs.eflags = context->EFlags;
 463 }
 464 #endif /* __HAVE_VM86 */
 465
 466
 467 /***********************************************************************
 468  *           save_context
 469  *
 470  * Set the register values from a sigcontext.
 471  */
 472 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 473 {
 474     WORD fs;
 475     /* get %fs at time of the fault */
 476 #ifdef FS_sig
 477     fs = FS_sig(sigcontext);
 478 #else
 479     fs = __get_fs();
 480 #endif
 481     context->SegFs = fs;
 482
 483     /* now restore a proper %fs for the fault handler */
 484     if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)))  /* 16-bit mode */
 485     {
 486         fs = SYSLEVEL_Win16CurrentTeb;
 487     }
 488 #ifdef __HAVE_VM86
 489     else if ((void *)EIP_sig(sigcontext) == vm86_return)  /* vm86 mode */
 490     {
 491         /* fetch the saved %fs on the stack */
 492         fs = *(unsigned int *)ESP_sig(sigcontext);
 493         if (EAX_sig(sigcontext) == VM86_EAX) {
 494             struct vm86plus_struct *vm86;
 495             __set_fs(fs);
 496             /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 497              * (but we could also get if from teb->vm86_ptr) */
 498             vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
 499             /* get context from vm86 struct */
 500             save_vm86_context( context, vm86 );
 501             return;
 502         }
 503     }
 504 #endif  /* __HAVE_VM86 */
 505
 506     __set_fs(fs);
 507
 508     context->Eax    = EAX_sig(sigcontext);
 509     context->Ebx    = EBX_sig(sigcontext);
 510     context->Ecx    = ECX_sig(sigcontext);
 511     context->Edx    = EDX_sig(sigcontext);
 512     context->Esi    = ESI_sig(sigcontext);
 513     context->Edi    = EDI_sig(sigcontext);
 514     context->Ebp    = EBP_sig(sigcontext);
 515     context->EFlags = EFL_sig(sigcontext);
 516     context->Eip    = EIP_sig(sigcontext);
 517     context->Esp    = ESP_sig(sigcontext);
 518     context->SegCs  = LOWORD(CS_sig(sigcontext));
 519     context->SegDs  = LOWORD(DS_sig(sigcontext));
 520     context->SegEs  = LOWORD(ES_sig(sigcontext));
 521     context->SegSs  = LOWORD(SS_sig(sigcontext));
 522 #ifdef GS_sig
 523     context->SegGs  = LOWORD(GS_sig(sigcontext));
 524 #else
 525     context->SegGs  = __get_gs();
 526 #endif
 527 }
 528
 529
 530 /***********************************************************************
 531  *           restore_context
 532  *
 533  * Build a sigcontext from the register values.
 534  */
 535 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 536 {
 537 #ifdef __HAVE_VM86
 538     /* check if exception occurred in vm86 mode */
 539     if ((void *)EIP_sig(sigcontext) == vm86_return &&
 540         IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
 541         EAX_sig(sigcontext) == VM86_EAX)
 542     {
 543         /* retrieve pointer to vm86plus struct that was stored in vm86_enter
 544          * (but we could also get it from teb->vm86_ptr) */
 545         struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
 546         restore_vm86_context( context, vm86 );
 547         return;
 548     }
 549 #endif /* __HAVE_VM86 */
 550
 551     EAX_sig(sigcontext) = context->Eax;
 552     EBX_sig(sigcontext) = context->Ebx;
 553     ECX_sig(sigcontext) = context->Ecx;
 554     EDX_sig(sigcontext) = context->Edx;
 555     ESI_sig(sigcontext) = context->Esi;
 556     EDI_sig(sigcontext) = context->Edi;
 557     EBP_sig(sigcontext) = context->Ebp;
 558     EFL_sig(sigcontext) = context->EFlags;
 559     EIP_sig(sigcontext) = context->Eip;
 560     ESP_sig(sigcontext) = context->Esp;
 561     CS_sig(sigcontext)  = context->SegCs;
 562     DS_sig(sigcontext)  = context->SegDs;
 563     ES_sig(sigcontext)  = context->SegEs;
 564     SS_sig(sigcontext)  = context->SegSs;
 565 #ifdef FS_sig
 566     FS_sig(sigcontext)  = context->SegFs;
 567 #else
 568     __set_fs( context->SegFs );
 569 #endif
 570 #ifdef GS_sig
 571     GS_sig(sigcontext)  = context->SegGs;
 572 #else
 573     __set_gs( context->SegGs );
 574 #endif
 575 }
 576
 577
 578 /***********************************************************************
 579  *           save_fpu
 580  *
 581  * Set the FPU context from a sigcontext.
 582  */
 583 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 584 {
 585 #ifdef FPU_sig
 586     if (FPU_sig(sigcontext))
 587     {
 588         context->FloatSave = *FPU_sig(sigcontext);
 589         return;
 590     }
 591 #endif  /* FPU_sig */
 592 #ifdef __GNUC__
 593     __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
 594 #endif  /* __GNUC__ */
 595 }
 596
 597
 598 /***********************************************************************
 599  *           restore_fpu
 600  *
 601  * Restore the FPU context to a sigcontext.
 602  */
 603 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
 604 {
 605     /* reset the current interrupt status */
 606     context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
 607 #ifdef FPU_sig
 608     if (FPU_sig(sigcontext))
 609     {
 610         *FPU_sig(sigcontext) = context->FloatSave;
 611         return;
 612     }
 613 #endif  /* FPU_sig */
 614 #ifdef __GNUC__
 615     /* avoid nested exceptions */
 616     __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
 617 #endif  /* __GNUC__ */
 618 }
 619
 620
 621 /**********************************************************************
 622  *              get_fpu_code
 623  *
 624  * Get the FPU exception code from the FPU status.
 625  */
 626 static inline DWORD get_fpu_code( const CONTEXT *context )
 627 {
 628     DWORD status = context->FloatSave.StatusWord;
 629
 630     if (status & 0x01)  /* IE */
 631     {
 632         if (status & 0x40)  /* SF */
 633             return EXCEPTION_FLT_STACK_CHECK;
 634         else
 635             return EXCEPTION_FLT_INVALID_OPERATION;
 636     }
 637     if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND;  /* DE flag */
 638     if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO;    /* ZE flag */
 639     if (status & 0x08) return EXCEPTION_FLT_OVERFLOW;          /* OE flag */
 640     if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW;         /* UE flag */
 641     if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT;    /* PE flag */
 642     return EXCEPTION_FLT_INVALID_OPERATION;  /* generic error */
 643 }
 644
 645
 646 /***********************************************************************
 647  *           SIGNAL_Unblock
 648  *
 649  * Unblock signals. Called from EXC_RtlRaiseException.
 650  */
 651 void SIGNAL_Unblock( void )
 652 {
 653     sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
 654 }
 655
 656
 657 /**********************************************************************
 658  *              do_segv
 659  *
 660  * Implementation of SIGSEGV handler.
 661  */
 662 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
 663 {
 664     EXCEPTION_RECORD rec;
 665     DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
 666
 667 #ifdef CR2_sig
 668     /* we want the page-fault case to be fast */
 669     if (trap_code == T_PAGEFLT)
 670         if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
 671 #endif
 672
 673     rec.ExceptionRecord  = NULL;
 674     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 675     rec.ExceptionAddress = (LPVOID)context->Eip;
 676     rec.NumberParameters = 0;
 677
 678     switch(trap_code)
 679     {
 680     case T_OFLOW:   /* Overflow exception */
 681         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 682         break;
 683     case T_BOUND:   /* Bound range exception */
 684         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 685         break;
 686     case T_PRIVINFLT:   /* Invalid opcode exception */
 687         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 688         break;
 689     case T_STKFLT:  /* Stack fault */
 690         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 691         break;
 692     case T_SEGNPFLT:  /* Segment not present exception */
 693     case T_PROTFLT:   /* General protection fault */
 694     case T_UNKNOWN:   /* Unknown fault code */
 695         if (INSTR_EmulateInstruction( context )) return;
 696         rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
 697         break;
 698     case T_PAGEFLT:  /* Page fault */
 699 #ifdef CR2_sig
 700         rec.NumberParameters = 2;
 701         rec.ExceptionInformation[0] = (err_code & 2) != 0;
 702         rec.ExceptionInformation[1] = (DWORD)cr2;
 703 #endif /* CR2_sig */
 704         rec.ExceptionCode = page_fault_code;
 705         break;
 706     case T_ALIGNFLT:  /* Alignment check exception */
 707         /* FIXME: pass through exception handler first? */
 708         if (context->EFlags & 0x00040000)
 709         {
 710             /* Disable AC flag, return */
 711             context->EFlags &= ~0x00040000;
 712             return;
 713         }
 714         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 715         break;
 716     default:
 717         ERR( "Got unexpected trap %d\n", trap_code );
 718         /* fall through */
 719     case T_NMI:       /* NMI interrupt */
 720     case T_DNA:       /* Device not available exception */
 721     case T_DOUBLEFLT: /* Double fault exception */
 722     case T_TSSFLT:    /* Invalid TSS exception */
 723     case T_RESERVED:  /* Unknown exception */
 724     case T_MCHK:      /* Machine check exception */
 725 #ifdef T_CACHEFLT
 726     case T_CACHEFLT:  /* Cache flush exception */
 727 #endif
 728         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 729         break;
 730     }
 731     EXC_RtlRaiseException( &rec, context );
 732 }
 733
 734
 735 /**********************************************************************
 736  *              do_trap
 737  *
 738  * Implementation of SIGTRAP handler.
 739  */
 740 static void do_trap( CONTEXT *context, int trap_code )
 741 {
 742     EXCEPTION_RECORD rec;
 743
 744     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 745     rec.ExceptionRecord  = NULL;
 746     rec.ExceptionAddress = (LPVOID)context->Eip;
 747     rec.NumberParameters = 0;
 748
 749     switch(trap_code)
 750     {
 751     case T_TRCTRAP:  /* Single-step exception */
 752         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 753         context->EFlags &= ~0x100;  /* clear single-step flag */
 754         break;
 755     case T_BPTFLT:   /* Breakpoint exception */
 756         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 757         /* fall through */
 758     default:
 759         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 760         break;
 761     }
 762     EXC_RtlRaiseException( &rec, context );
 763 }
 764
 765
 766 /**********************************************************************
 767  *              do_fpe
 768  *
 769  * Implementation of SIGFPE handler
 770  */
 771 static void do_fpe( CONTEXT *context, int trap_code )
 772 {
 773     EXCEPTION_RECORD rec;
 774
 775     switch(trap_code)
 776     {
 777     case T_DIVIDE:   /* Division by zero exception */
 778         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 779         break;
 780     case T_FPOPFLT:   /* Coprocessor segment overrun */
 781         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 782         break;
 783     case T_ARITHTRAP:  /* Floating point exception */
 784     case T_UNKNOWN:    /* Unknown fault code */
 785         rec.ExceptionCode = get_fpu_code( context );
 786         break;
 787     default:
 788         ERR( "Got unexpected trap %d\n", trap_code );
 789         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 790         break;
 791     }
 792     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 793     rec.ExceptionRecord  = NULL;
 794     rec.ExceptionAddress = (LPVOID)context->Eip;
 795     rec.NumberParameters = 0;
 796     EXC_RtlRaiseException( &rec, context );
 797 }
 798
 799
 800 #ifdef __HAVE_VM86
 801 /**********************************************************************
 802  *              set_vm86_pend
 803  *
 804  * Handler for SIGUSR2, which we use to set the vm86 pending flag.
 805  */
 806 static void set_vm86_pend( CONTEXT *context )
 807 {
 808     EXCEPTION_RECORD rec;
 809     TEB *teb = NtCurrentTeb();
 810     struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
 811
 812     rec.ExceptionCode           = EXCEPTION_VM86_STI;
 813     rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
 814     rec.ExceptionRecord         = NULL;
 815     rec.NumberParameters        = 1;
 816     rec.ExceptionInformation[0] = 0;
 817
 818     /* __wine_enter_vm86() merges the vm86_pending flag in safely */
 819     teb->vm86_pending |= VIP_MASK;
 820     /* see if we were in VM86 mode */
 821     if (context->EFlags & 0x00020000)
 822     {
 823         /* seems so, also set flag in signal context */
 824         if (context->EFlags & VIP_MASK) return;
 825         context->EFlags |= VIP_MASK;
 826         vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
 827         if (context->EFlags & VIF_MASK) {
 828             /* VIF is set, throw exception */
 829             teb->vm86_pending = 0;
 830             teb->vm86_ptr = NULL;
 831             rec.ExceptionAddress = (LPVOID)context->Eip;
 832             EXC_RtlRaiseException( &rec, context );
 833             teb->vm86_ptr = vm86;
 834         }
 835     }
 836     else if (vm86)
 837     {
 838         /* not in VM86, but possibly setting up for it */
 839         if (vm86->regs.eflags & VIP_MASK) return;
 840         vm86->regs.eflags |= VIP_MASK;
 841         if (((char*)context->Eip >= (char*)vm86_return) &&
 842             ((char*)context->Eip <= (char*)vm86_return_end) &&
 843             (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
 844             /* exiting from VM86, can't throw */
 845             return;
 846         }
 847         if (vm86->regs.eflags & VIF_MASK) {
 848             /* VIF is set, throw exception */
 849             CONTEXT vcontext;
 850             teb->vm86_pending = 0;
 851             teb->vm86_ptr = NULL;
 852             save_vm86_context( &vcontext, vm86 );
 853             rec.ExceptionAddress = (LPVOID)vcontext.Eip;
 854             EXC_RtlRaiseException( &rec, &vcontext );
 855             teb->vm86_ptr = vm86;
 856             restore_vm86_context( &vcontext, vm86 );
 857         }
 858     }
 859 }
 860
 861
 862 /**********************************************************************
 863  *              usr2_handler
 864  *
 865  * Handler for SIGUSR2.
 866  * We use it to signal that the running __wine_enter_vm86() should
 867  * immediately set VIP_MASK, causing pending events to be handled
 868  * as early as possible.
 869  */
 870 static HANDLER_DEF(usr2_handler)
 871 {
 872     CONTEXT context;
 873
 874     save_context( &context, HANDLER_CONTEXT );
 875     set_vm86_pend( &context );
 876     restore_context( &context, HANDLER_CONTEXT );
 877 }
 878
 879
 880 /**********************************************************************
 881  *              alrm_handler
 882  *
 883  * Handler for SIGALRM.
 884  * Increases the alarm counter and sets the vm86 pending flag.
 885  */
 886 static HANDLER_DEF(alrm_handler)
 887 {
 888     CONTEXT context;
 889
 890     save_context( &context, HANDLER_CONTEXT );
 891     NtCurrentTeb()->alarms++;
 892     set_vm86_pend( &context );
 893     restore_context( &context, HANDLER_CONTEXT );
 894 }
 895 #endif /* __HAVE_VM86 */
 896
 897
 898 /**********************************************************************
 899  *              segv_handler
 900  *
 901  * Handler for SIGSEGV and related errors.
 902  */
 903 static HANDLER_DEF(segv_handler)
 904 {
 905     CONTEXT context;
 906     save_context( &context, HANDLER_CONTEXT );
 907     do_segv( &context, get_trap_code(HANDLER_CONTEXT),
 908              get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
 909     restore_context( &context, HANDLER_CONTEXT );
 910 }
 911
 912
 913 /**********************************************************************
 914  *              trap_handler
 915  *
 916  * Handler for SIGTRAP.
 917  */
 918 static HANDLER_DEF(trap_handler)
 919 {
 920     CONTEXT context;
 921     save_context( &context, HANDLER_CONTEXT );
 922     do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
 923     restore_context( &context, HANDLER_CONTEXT );
 924 }
 925
 926
 927 /**********************************************************************
 928  *              fpe_handler
 929  *
 930  * Handler for SIGFPE.
 931  */
 932 static HANDLER_DEF(fpe_handler)
 933 {
 934     CONTEXT context;
 935     save_fpu( &context, HANDLER_CONTEXT );
 936     save_context( &context, HANDLER_CONTEXT );
 937     do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
 938     restore_context( &context, HANDLER_CONTEXT );
 939     restore_fpu( &context, HANDLER_CONTEXT );
 940 }
 941
 942
 943 /**********************************************************************
 944  *              int_handler
 945  *
 946  * Handler for SIGINT.
 947  */
 948 static HANDLER_DEF(int_handler)
 949 {
 950     EXCEPTION_RECORD rec;
 951     CONTEXT context;
 952
 953     save_context( &context, HANDLER_CONTEXT );
 954     rec.ExceptionCode    = CONTROL_C_EXIT;
 955     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 956     rec.ExceptionRecord  = NULL;
 957     rec.ExceptionAddress = (LPVOID)context.Eip;
 958     rec.NumberParameters = 0;
 959     EXC_RtlRaiseException( &rec, &context );
 960     restore_context( &context, HANDLER_CONTEXT );
 961 }
 962
 963
 964 /***********************************************************************
 965  *           set_handler
 966  *
 967  * Set a signal handler
 968  */
 969 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
 970 {
 971     struct sigaction sig_act;
 972
 973 #ifdef linux
 974     if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
 975     {
 976         struct kernel_sigaction sig_act;
 977         sig_act.ksa_handler = func;
 978         sig_act.ksa_flags   = SA_RESTART;
 979         sig_act.ksa_mask    = (1 << (SIGINT-1)) |
 980                               (1 << (SIGALRM-1));
 981         /* point to the top of the stack */
 982         sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
 983         return wine_sigaction( sig, &sig_act, NULL );
 984     }
 985 #endif  /* linux */
 986     sig_act.sa_handler = func;
 987     sigemptyset( &sig_act.sa_mask );
 988     sigaddset( &sig_act.sa_mask, SIGINT );
 989     sigaddset( &sig_act.sa_mask, SIGALRM );
 990
 991 #ifdef linux
 992     sig_act.sa_flags = SA_RESTART;
 993 #elif defined (__svr4__) || defined(_SCO_DS)
 994     sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
 995 #else
 996     sig_act.sa_flags = 0;
 997 #endif
 998
 999 #ifdef SA_ONSTACK
1000     if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1001 #endif
1002     return sigaction( sig, &sig_act, NULL );
1003 }
1004
1005
1006 /**********************************************************************
1007  *              SIGNAL_Init
1008  */
1009 BOOL SIGNAL_Init(void)
1010 {
1011     int have_sigaltstack = 0;
1012
1013 #ifdef HAVE_SIGALTSTACK
1014     struct sigaltstack ss;
1015     if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1016     {
1017         ss.ss_size  = SIGNAL_STACK_SIZE;
1018         ss.ss_flags = 0;
1019         if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1020 #ifdef linux
1021         /* sigaltstack may fail because the kernel is too old, or
1022            because glibc is brain-dead. In the latter case a
1023            direct system call should succeed. */
1024         else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1025 #endif  /* linux */
1026     }
1027 #endif  /* HAVE_SIGALTSTACK */
1028
1029     sigfillset( &all_sigs );
1030
1031     /* automatic child reaping to avoid zombies */
1032     signal( SIGCHLD, SIG_IGN );
1033
1034     if (set_handler( SIGINT,  have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1035     if (set_handler( SIGFPE,  have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1036     if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1037     if (set_handler( SIGILL,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1038 #ifdef SIGBUS
1039     if (set_handler( SIGBUS,  have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1040 #endif
1041 #ifdef SIGTRAP
1042     if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1043 #endif
1044
1045 #ifdef __HAVE_VM86
1046     if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
1047     if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1048 #endif
1049
1050     return TRUE;
1051
1052  error:
1053     perror("sigaction");
1054     return FALSE;
1055 }
1056
1057
1058 /**********************************************************************
1059  *              SIGNAL_Reset
1060  */
1061 void SIGNAL_Reset(void)
1062 {
1063     sigset_t block_set;
1064
1065     /* block the async signals */
1066     sigemptyset( &block_set );
1067     sigaddset( &block_set, SIGALRM );
1068     sigaddset( &block_set, SIGIO );
1069     sigaddset( &block_set, SIGHUP );
1070     sigaddset( &block_set, SIGUSR2 );
1071     sigprocmask( SIG_BLOCK, &block_set, NULL );
1072
1073     /* restore default handlers */
1074     signal( SIGINT, SIG_DFL );
1075     signal( SIGFPE, SIG_DFL );
1076     signal( SIGSEGV, SIG_DFL );
1077     signal( SIGILL, SIG_DFL );
1078 #ifdef SIGBUS
1079     signal( SIGBUS, SIG_DFL );
1080 #endif
1081 #ifdef SIGTRAP
1082     signal( SIGTRAP, SIG_DFL );
1083 #endif
1084 }
1085
1086
1087 #ifdef __HAVE_VM86
1088 /**********************************************************************
1089  *              __wine_enter_vm86
1090  *
1091  * Enter vm86 mode with the specified register context.
1092  */
1093 void __wine_enter_vm86( CONTEXT *context )
1094 {
1095     EXCEPTION_RECORD rec;
1096     TEB *teb = NtCurrentTeb();
1097     int res;
1098     struct vm86plus_struct vm86;
1099
1100     memset( &vm86, 0, sizeof(vm86) );
1101     for (;;)
1102     {
1103         restore_vm86_context( context, &vm86 );
1104         /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1105          * so save it on entry, just in case */
1106         teb->vm86_pending |= (context->EFlags & VIP_MASK);
1107         /* Work around race conditions with signal handler
1108          * (avoiding sigprocmask for performance reasons) */
1109         teb->vm86_ptr = &vm86;
1110         vm86.regs.eflags |= teb->vm86_pending;
1111         /* Check for VIF|VIP here, since vm86_enter doesn't */
1112         if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1113             teb->vm86_ptr = NULL;
1114             teb->vm86_pending = 0;
1115             context->EFlags |= VIP_MASK;
1116             rec.ExceptionCode = EXCEPTION_VM86_STI;
1117             rec.ExceptionInformation[0] = 0;
1118             goto cancel_vm86;
1119         }
1120
1121         do
1122         {
1123             res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1124             if (res < 0)
1125             {
1126                 errno = -res;
1127                 return;
1128             }
1129         } while (VM86_TYPE(res) == VM86_SIGNAL);
1130
1131         save_vm86_context( context, &vm86 );
1132         context->EFlags |= teb->vm86_pending;
1133
1134         switch(VM86_TYPE(res))
1135         {
1136         case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1137             do_segv( context, T_PROTFLT, 0, 0 );
1138             continue;
1139         case VM86_TRAP: /* return due to DOS-debugger request */
1140             do_trap( context, VM86_ARG(res) );
1141             continue;
1142         case VM86_INTx: /* int3/int x instruction (ARG = x) */
1143             rec.ExceptionCode = EXCEPTION_VM86_INTx;
1144             break;
1145         case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1146             teb->vm86_pending = 0;
1147             rec.ExceptionCode = EXCEPTION_VM86_STI;
1148             break;
1149         case VM86_PICRETURN: /* return due to pending PIC request */
1150             rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1151             break;
1152         default:
1153             ERR( "unhandled result from vm86 mode %x\n", res );
1154             continue;
1155         }
1156         rec.ExceptionInformation[0] = VM86_ARG(res);
1157 cancel_vm86:
1158         rec.ExceptionFlags          = EXCEPTION_CONTINUABLE;
1159         rec.ExceptionRecord         = NULL;
1160         rec.ExceptionAddress        = (LPVOID)context->Eip;
1161         rec.NumberParameters        = 1;
1162         EXC_RtlRaiseException( &rec, context );
1163     }
1164 }
1165
1166 #else /* __HAVE_VM86 */
1167 void __wine_enter_vm86( CONTEXT *context )
1168 {
1169     MESSAGE("vm86 mode not supported on this platform\n");
1170 }
1171 #endif /* __HAVE_VM86 */
1172
1173 /**********************************************************************
1174  *              DbgBreakPoint   (NTDLL.@)
1175  */
1176 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1177
1178 /**********************************************************************
1179  *              DbgUserBreakPoint   (NTDLL.@)
1180  */
1181 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1182
1183 #endif  /* __i386__ */