dlls/ntdll/signal_x86_64.c

   1 /*
   2  * x86-64 signal handling routines
   3  *
   4  * Copyright 1999, 2005 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #ifdef __x86_64__
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <assert.h>
  27 #include <signal.h>
  28 #include <stdlib.h>
  29 #include <stdarg.h>
  30 #include <stdio.h>
  31 #ifdef HAVE_UNISTD_H
  32 # include <unistd.h>
  33 #endif
  34
  35 #ifdef HAVE_SYS_PARAM_H
  36 # include <sys/param.h>
  37 #endif
  38 #ifdef HAVE_SYS_SIGNAL_H
  39 # include <sys/signal.h>
  40 #endif
  41
  42 #define NONAMELESSUNION
  43 #include "windef.h"
  44 #include "winternl.h"
  45 #include "wine/library.h"
  46 #include "wine/exception.h"
  47 #include "ntdll_misc.h"
  48 #include "wine/debug.h"
  49
  50 WINE_DEFAULT_DEBUG_CHANNEL(seh);
  51
  52
  53 /***********************************************************************
  54  * signal context platform-specific definitions
  55  */
  56 #ifdef linux
  57
  58 #include <asm/prctl.h>
  59 extern int arch_prctl(int func, void *ptr);
  60
  61 typedef struct ucontext SIGCONTEXT;
  62
  63 # define HANDLER_DEF(name) void name( int __signal, struct siginfo *__siginfo, SIGCONTEXT *__context )
  64 # define HANDLER_CONTEXT (__context)
  65
  66 #define RAX_sig(context)     ((context)->uc_mcontext.gregs[REG_RAX])
  67 #define RBX_sig(context)     ((context)->uc_mcontext.gregs[REG_RBX])
  68 #define RCX_sig(context)     ((context)->uc_mcontext.gregs[REG_RCX])
  69 #define RDX_sig(context)     ((context)->uc_mcontext.gregs[REG_RDX])
  70 #define RSI_sig(context)     ((context)->uc_mcontext.gregs[REG_RSI])
  71 #define RDI_sig(context)     ((context)->uc_mcontext.gregs[REG_RDI])
  72 #define RBP_sig(context)     ((context)->uc_mcontext.gregs[REG_RBP])
  73 #define R8_sig(context)      ((context)->uc_mcontext.gregs[REG_R8])
  74 #define R9_sig(context)      ((context)->uc_mcontext.gregs[REG_R9])
  75 #define R10_sig(context)     ((context)->uc_mcontext.gregs[REG_R10])
  76 #define R11_sig(context)     ((context)->uc_mcontext.gregs[REG_R11])
  77 #define R12_sig(context)     ((context)->uc_mcontext.gregs[REG_R12])
  78 #define R13_sig(context)     ((context)->uc_mcontext.gregs[REG_R13])
  79 #define R14_sig(context)     ((context)->uc_mcontext.gregs[REG_R14])
  80 #define R15_sig(context)     ((context)->uc_mcontext.gregs[REG_R15])
  81
  82 #define CS_sig(context)      (*((WORD *)&(context)->uc_mcontext.gregs[REG_CSGSFS] + 0))
  83 #define GS_sig(context)      (*((WORD *)&(context)->uc_mcontext.gregs[REG_CSGSFS] + 1))
  84 #define FS_sig(context)      (*((WORD *)&(context)->uc_mcontext.gregs[REG_CSGSFS] + 2))
  85
  86 #define RSP_sig(context)     ((context)->uc_mcontext.gregs[REG_RSP])
  87 #define RIP_sig(context)     ((context)->uc_mcontext.gregs[REG_RIP])
  88 #define EFL_sig(context)     ((context)->uc_mcontext.gregs[REG_EFL])
  89 #define TRAP_sig(context)    ((context)->uc_mcontext.gregs[REG_TRAPNO])
  90 #define ERROR_sig(context)   ((context)->uc_mcontext.gregs[REG_ERR])
  91
  92 #define FPU_sig(context)     ((XMM_SAVE_AREA32 *)((context)->uc_mcontext.fpregs))
  93
  94 #define FAULT_CODE     (__siginfo->si_code)
  95 #define FAULT_ADDRESS  (__siginfo->si_addr)
  96
  97 #endif /* linux */
  98
  99 #if defined(__NetBSD__)
 100 # include <sys/ucontext.h>
 101 # include <sys/types.h>
 102 # include <signal.h>
 103
 104 typedef ucontext_t SIGCONTEXT;
 105
 106 #define RAX_sig(context)    ((context)->uc_mcontext.__gregs[_REG_RAX])
 107 #define RBX_sig(context)    ((context)->uc_mcontext.__gregs[_REG_RBX])
 108 #define RCX_sig(context)    ((context)->uc_mcontext.__gregs[_REG_RCX])
 109 #define RDX_sig(context)    ((context)->uc_mcontext.__gregs[_REG_RDX])
 110 #define RSI_sig(context)    ((context)->uc_mcontext.__gregs[_REG_RSI])
 111 #define RDI_sig(context)    ((context)->uc_mcontext.__gregs[_REG_RDI])
 112 #define RBP_sig(context)    ((context)->uc_mcontext.__gregs[_REG_RBP])
 113 #define R8_sig(context)     ((context)->uc_mcontext.__gregs[_REG_R8])
 114 #define R9_sig(context)     ((context)->uc_mcontext.__gregs[_REG_R9])
 115 #define R10_sig(context)    ((context)->uc_mcontext.__gregs[_REG_R10])
 116 #define R11_sig(context)    ((context)->uc_mcontext.__gregs[_REG_R11])
 117 #define R12_sig(context)    ((context)->uc_mcontext.__gregs[_REG_R12])
 118 #define R13_sig(context)    ((context)->uc_mcontext.__gregs[_REG_R13])
 119 #define R14_sig(context)    ((context)->uc_mcontext.__gregs[_REG_R14])
 120 #define R15_sig(context)    ((context)->uc_mcontext.__gregs[_REG_R15])
 121
 122 #define CS_sig(context)     ((context)->uc_mcontext.__gregs[_REG_CS])
 123 #define DS_sig(context)     ((context)->uc_mcontext.__gregs[_REG_DS])
 124 #define ES_sig(context)     ((context)->uc_mcontext.__gregs[_REG_ES])
 125 #define FS_sig(context)     ((context)->uc_mcontext.__gregs[_REG_FS])
 126 #define GS_sig(context)     ((context)->uc_mcontext.__gregs[_REG_GS])
 127 #define SS_sig(context)     ((context)->uc_mcontext.__gregs[_REG_SS])
 128
 129 #define EFL_sig(context)    ((context)->uc_mcontext.__gregs[_REG_RFL])
 130
 131 #define RIP_sig(context)    (*((unsigned long*)&(context)->uc_mcontext.__gregs[_REG_RIP]))
 132 #define RSP_sig(context)    (*((unsigned long*)&(context)->uc_mcontext.__gregs[_REG_URSP]))
 133
 134 #define TRAP_sig(context)   ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
 135 #define ERROR_sig(context)  ((context)->uc_mcontext.__gregs[_REG_ERR])
 136
 137 #define FAULT_CODE          (__siginfo->si_code)
 138 #define FAULT_ADDRESS       (__siginfo->si_addr)
 139
 140 #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
 141 #define HANDLER_CONTEXT (__context)
 142
 143 #define FPU_sig(context)   ((XMM_SAVE_AREA32 *)((context)->uc_mcontext.__fpregs))
 144 #endif /* __NetBSD__ */
 145
 146 enum i386_trap_code
 147 {
 148     TRAP_x86_UNKNOWN    = -1,  /* Unknown fault (TRAP_sig not defined) */
 149     TRAP_x86_DIVIDE     = 0,   /* Division by zero exception */
 150     TRAP_x86_TRCTRAP    = 1,   /* Single-step exception */
 151     TRAP_x86_NMI        = 2,   /* NMI interrupt */
 152     TRAP_x86_BPTFLT     = 3,   /* Breakpoint exception */
 153     TRAP_x86_OFLOW      = 4,   /* Overflow exception */
 154     TRAP_x86_BOUND      = 5,   /* Bound range exception */
 155     TRAP_x86_PRIVINFLT  = 6,   /* Invalid opcode exception */
 156     TRAP_x86_DNA        = 7,   /* Device not available exception */
 157     TRAP_x86_DOUBLEFLT  = 8,   /* Double fault exception */
 158     TRAP_x86_FPOPFLT    = 9,   /* Coprocessor segment overrun */
 159     TRAP_x86_TSSFLT     = 10,  /* Invalid TSS exception */
 160     TRAP_x86_SEGNPFLT   = 11,  /* Segment not present exception */
 161     TRAP_x86_STKFLT     = 12,  /* Stack fault */
 162     TRAP_x86_PROTFLT    = 13,  /* General protection fault */
 163     TRAP_x86_PAGEFLT    = 14,  /* Page fault */
 164     TRAP_x86_ARITHTRAP  = 16,  /* Floating point exception */
 165     TRAP_x86_ALIGNFLT   = 17,  /* Alignment check exception */
 166     TRAP_x86_MCHK       = 18,  /* Machine check exception */
 167     TRAP_x86_CACHEFLT   = 19   /* Cache flush exception */
 168 };
 169
 170 typedef int (*wine_signal_handler)(unsigned int sig);
 171
 172 static wine_signal_handler handlers[256];
 173
 174 /***********************************************************************
 175  *           dispatch_signal
 176  */
 177 static inline int dispatch_signal(unsigned int sig)
 178 {
 179     if (handlers[sig] == NULL) return 0;
 180     return handlers[sig](sig);
 181 }
 182
 183 /***********************************************************************
 184  *           save_context
 185  *
 186  * Set the register values from a sigcontext.
 187  */
 188 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
 189 {
 190     context->Rax    = RAX_sig(sigcontext);
 191     context->Rcx    = RCX_sig(sigcontext);
 192     context->Rdx    = RDX_sig(sigcontext);
 193     context->Rbx    = RBX_sig(sigcontext);
 194     context->Rsp    = RSP_sig(sigcontext);
 195     context->Rbp    = RBP_sig(sigcontext);
 196     context->Rsi    = RSI_sig(sigcontext);
 197     context->Rdi    = RDI_sig(sigcontext);
 198     context->R8     = R8_sig(sigcontext);
 199     context->R9     = R9_sig(sigcontext);
 200     context->R10    = R10_sig(sigcontext);
 201     context->R11    = R11_sig(sigcontext);
 202     context->R12    = R12_sig(sigcontext);
 203     context->R13    = R13_sig(sigcontext);
 204     context->R14    = R14_sig(sigcontext);
 205     context->R15    = R15_sig(sigcontext);
 206     context->Rip    = RIP_sig(sigcontext);
 207     context->SegCs  = CS_sig(sigcontext);
 208     context->SegFs  = FS_sig(sigcontext);
 209     context->SegGs  = GS_sig(sigcontext);
 210     context->EFlags = EFL_sig(sigcontext);
 211     context->SegDs  = 0;  /* FIXME */
 212     context->SegEs  = 0;  /* FIXME */
 213     context->SegSs  = 0;  /* FIXME */
 214     context->MxCsr  = 0;  /* FIXME */
 215     if (FPU_sig(sigcontext)) context->u.FltSave = *FPU_sig(sigcontext);
 216 }
 217
 218
 219 /***********************************************************************
 220  *           restore_context
 221  *
 222  * Build a sigcontext from the register values.
 223  */
 224 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
 225 {
 226     RAX_sig(sigcontext) = context->Rax;
 227     RCX_sig(sigcontext) = context->Rcx;
 228     RDX_sig(sigcontext) = context->Rdx;
 229     RBX_sig(sigcontext) = context->Rbx;
 230     RSP_sig(sigcontext) = context->Rsp;
 231     RBP_sig(sigcontext) = context->Rbp;
 232     RSI_sig(sigcontext) = context->Rsi;
 233     RDI_sig(sigcontext) = context->Rdi;
 234     R8_sig(sigcontext)  = context->R8;
 235     R9_sig(sigcontext)  = context->R9;
 236     R10_sig(sigcontext) = context->R10;
 237     R11_sig(sigcontext) = context->R11;
 238     R12_sig(sigcontext) = context->R12;
 239     R13_sig(sigcontext) = context->R13;
 240     R14_sig(sigcontext) = context->R14;
 241     R15_sig(sigcontext) = context->R15;
 242     RIP_sig(sigcontext) = context->Rip;
 243     CS_sig(sigcontext)  = context->SegCs;
 244     FS_sig(sigcontext)  = context->SegFs;
 245     GS_sig(sigcontext)  = context->SegGs;
 246     EFL_sig(sigcontext) = context->EFlags;
 247     if (FPU_sig(sigcontext)) *FPU_sig(sigcontext) = context->u.FltSave;
 248 }
 249
 250
 251 /***********************************************************************
 252  *              RtlCaptureContext (NTDLL.@)
 253  */
 254 void WINAPI __regs_RtlCaptureContext( CONTEXT *context, CONTEXT *regs )
 255 {
 256     *context = *regs;
 257 }
 258 DEFINE_REGS_ENTRYPOINT( RtlCaptureContext, 1 )
 259
 260
 261 /***********************************************************************
 262  *           set_cpu_context
 263  *
 264  * Set the new CPU context.
 265  */
 266 void set_cpu_context( const CONTEXT *context )
 267 {
 268     FIXME("not implemented\n");
 269 }
 270
 271
 272 /**********************************************************************
 273  *              segv_handler
 274  *
 275  * Handler for SIGSEGV and related errors.
 276  */
 277 static HANDLER_DEF(segv_handler)
 278 {
 279     EXCEPTION_RECORD rec;
 280     CONTEXT context;
 281
 282     save_context( &context, HANDLER_CONTEXT );
 283
 284     rec.ExceptionRecord  = NULL;
 285     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 286     rec.ExceptionAddress = (LPVOID)context.Rip;
 287     rec.NumberParameters = 0;
 288
 289     switch(TRAP_sig(HANDLER_CONTEXT))
 290     {
 291     case TRAP_x86_OFLOW:   /* Overflow exception */
 292         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 293         break;
 294     case TRAP_x86_BOUND:   /* Bound range exception */
 295         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 296         break;
 297     case TRAP_x86_PRIVINFLT:   /* Invalid opcode exception */
 298         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 299         break;
 300     case TRAP_x86_STKFLT:  /* Stack fault */
 301         rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
 302         break;
 303     case TRAP_x86_SEGNPFLT:  /* Segment not present exception */
 304     case TRAP_x86_PROTFLT:   /* General protection fault */
 305     case TRAP_x86_UNKNOWN:   /* Unknown fault code */
 306         rec.ExceptionCode = ERROR_sig(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
 307                                                        : EXCEPTION_PRIV_INSTRUCTION;
 308         break;
 309     case TRAP_x86_PAGEFLT:  /* Page fault */
 310         rec.ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
 311 #ifdef FAULT_ADDRESS
 312         rec.NumberParameters = 2;
 313         rec.ExceptionInformation[0] = (ERROR_sig(HANDLER_CONTEXT) & 2) != 0;
 314         rec.ExceptionInformation[1] = (ULONG_PTR)FAULT_ADDRESS;
 315         if (!(rec.ExceptionCode = virtual_handle_fault( FAULT_ADDRESS, rec.ExceptionInformation[0] )))
 316             goto done;
 317 #endif
 318         break;
 319     case TRAP_x86_ALIGNFLT:  /* Alignment check exception */
 320         rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
 321         break;
 322     default:
 323         ERR( "Got unexpected trap %ld\n", TRAP_sig(HANDLER_CONTEXT) );
 324         /* fall through */
 325     case TRAP_x86_NMI:       /* NMI interrupt */
 326     case TRAP_x86_DNA:       /* Device not available exception */
 327     case TRAP_x86_DOUBLEFLT: /* Double fault exception */
 328     case TRAP_x86_TSSFLT:    /* Invalid TSS exception */
 329     case TRAP_x86_MCHK:      /* Machine check exception */
 330     case TRAP_x86_CACHEFLT:  /* Cache flush exception */
 331         rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
 332         break;
 333     }
 334
 335     __regs_RtlRaiseException( &rec, &context );
 336 done:
 337     restore_context( &context, HANDLER_CONTEXT );
 338 }
 339
 340 /**********************************************************************
 341  *              trap_handler
 342  *
 343  * Handler for SIGTRAP.
 344  */
 345 static HANDLER_DEF(trap_handler)
 346 {
 347     EXCEPTION_RECORD rec;
 348     CONTEXT context;
 349
 350     save_context( &context, HANDLER_CONTEXT );
 351     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 352     rec.ExceptionRecord  = NULL;
 353     rec.ExceptionAddress = (LPVOID)context.Rip;
 354     rec.NumberParameters = 0;
 355
 356     switch(FAULT_CODE)
 357     {
 358     case TRAP_TRACE:  /* Single-step exception */
 359         rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
 360         EFL_sig(HANDLER_CONTEXT) &= ~0x100;  /* clear single-step flag */
 361         break;
 362     case TRAP_BRKPT:   /* Breakpoint exception */
 363         rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1;  /* back up over the int3 instruction */
 364         /* fall through */
 365     default:
 366         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
 367         break;
 368     }
 369
 370     __regs_RtlRaiseException( &rec, &context );
 371     restore_context( &context, HANDLER_CONTEXT );
 372 }
 373
 374 /**********************************************************************
 375  *              fpe_handler
 376  *
 377  * Handler for SIGFPE.
 378  */
 379 static HANDLER_DEF(fpe_handler)
 380 {
 381     EXCEPTION_RECORD rec;
 382     CONTEXT context;
 383
 384     save_context( &context, HANDLER_CONTEXT );
 385     rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 386     rec.ExceptionRecord  = NULL;
 387     rec.ExceptionAddress = (LPVOID)context.Rip;
 388     rec.NumberParameters = 0;
 389
 390     switch (FAULT_CODE)
 391     {
 392     case FPE_FLTSUB:
 393         rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
 394         break;
 395     case FPE_INTDIV:
 396         rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
 397         break;
 398     case FPE_INTOVF:
 399         rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
 400         break;
 401     case FPE_FLTDIV:
 402         rec.ExceptionCode = EXCEPTION_FLT_DIVIDE_BY_ZERO;
 403         break;
 404     case FPE_FLTOVF:
 405         rec.ExceptionCode = EXCEPTION_FLT_OVERFLOW;
 406         break;
 407     case FPE_FLTUND:
 408         rec.ExceptionCode = EXCEPTION_FLT_UNDERFLOW;
 409         break;
 410     case FPE_FLTRES:
 411         rec.ExceptionCode = EXCEPTION_FLT_INEXACT_RESULT;
 412         break;
 413     case FPE_FLTINV:
 414     default:
 415         rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
 416         break;
 417     }
 418
 419     __regs_RtlRaiseException( &rec, &context );
 420     restore_context( &context, HANDLER_CONTEXT );
 421 }
 422
 423 /**********************************************************************
 424  *              int_handler
 425  *
 426  * Handler for SIGINT.
 427  */
 428 static HANDLER_DEF(int_handler)
 429 {
 430     if (!dispatch_signal(SIGINT))
 431     {
 432         EXCEPTION_RECORD rec;
 433         CONTEXT context;
 434
 435         save_context( &context, HANDLER_CONTEXT );
 436         rec.ExceptionCode    = CONTROL_C_EXIT;
 437         rec.ExceptionFlags   = EXCEPTION_CONTINUABLE;
 438         rec.ExceptionRecord  = NULL;
 439         rec.ExceptionAddress = (LPVOID)context.Rip;
 440         rec.NumberParameters = 0;
 441         __regs_RtlRaiseException( &rec, &context );
 442         restore_context( &context, HANDLER_CONTEXT );
 443     }
 444 }
 445
 446
 447 /**********************************************************************
 448  *              abrt_handler
 449  *
 450  * Handler for SIGABRT.
 451  */
 452 static HANDLER_DEF(abrt_handler)
 453 {
 454     EXCEPTION_RECORD rec;
 455     CONTEXT context;
 456
 457     save_context( &context, HANDLER_CONTEXT );
 458     rec.ExceptionCode    = EXCEPTION_WINE_ASSERTION;
 459     rec.ExceptionFlags   = EH_NONCONTINUABLE;
 460     rec.ExceptionRecord  = NULL;
 461     rec.ExceptionAddress = (LPVOID)context.Rip;
 462     rec.NumberParameters = 0;
 463     __regs_RtlRaiseException( &rec, &context ); /* Should never return.. */
 464     restore_context( &context, HANDLER_CONTEXT );
 465 }
 466
 467
 468 /**********************************************************************
 469  *              quit_handler
 470  *
 471  * Handler for SIGQUIT.
 472  */
 473 static HANDLER_DEF(quit_handler)
 474 {
 475     abort_thread(0);
 476 }
 477
 478
 479 /**********************************************************************
 480  *              usr1_handler
 481  *
 482  * Handler for SIGUSR1, used to signal a thread that it got suspended.
 483  */
 484 static HANDLER_DEF(usr1_handler)
 485 {
 486     CONTEXT context;
 487
 488     save_context( &context, HANDLER_CONTEXT );
 489     wait_suspend( &context );
 490     restore_context( &context, HANDLER_CONTEXT );
 491 }
 492
 493
 494 /**********************************************************************
 495  *              get_signal_stack_total_size
 496  *
 497  * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
 498  * Must be a power of two.
 499  */
 500 size_t get_signal_stack_total_size(void)
 501 {
 502     assert( sizeof(TEB) <= 2*getpagesize() );
 503     return 2*getpagesize();  /* this is just for the TEB, we don't need a signal stack */
 504 }
 505
 506
 507 /***********************************************************************
 508  *           set_handler
 509  *
 510  * Set a signal handler
 511  */
 512 static int set_handler( int sig, void (*func)() )
 513 {
 514     struct sigaction sig_act;
 515
 516     sig_act.sa_sigaction = func;
 517     sig_act.sa_mask = server_block_set;
 518     sig_act.sa_flags = SA_RESTART | SA_SIGINFO | SA_ONSTACK;
 519     return sigaction( sig, &sig_act, NULL );
 520 }
 521
 522
 523 /***********************************************************************
 524  *           __wine_set_signal_handler   (NTDLL.@)
 525  */
 526 int CDECL __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
 527 {
 528     if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
 529     if (handlers[sig] != NULL) return -2;
 530     handlers[sig] = wsh;
 531     return 0;
 532 }
 533
 534
 535 /**********************************************************************
 536  *              signal_init_thread
 537  */
 538 void signal_init_thread( TEB *teb )
 539 {
 540 #ifdef __linux__
 541     arch_prctl( ARCH_SET_GS, teb );
 542 #else
 543 # error Please define setting %gs for your architecture
 544 #endif
 545 }
 546
 547 /**********************************************************************
 548  *              signal_init_process
 549  */
 550 void signal_init_process(void)
 551 {
 552     if (set_handler( SIGINT,  (void (*)())int_handler ) == -1) goto error;
 553     if (set_handler( SIGFPE,  (void (*)())fpe_handler ) == -1) goto error;
 554     if (set_handler( SIGSEGV, (void (*)())segv_handler ) == -1) goto error;
 555     if (set_handler( SIGILL,  (void (*)())segv_handler ) == -1) goto error;
 556     if (set_handler( SIGABRT, (void (*)())abrt_handler ) == -1) goto error;
 557     if (set_handler( SIGQUIT, (void (*)())quit_handler ) == -1) goto error;
 558     if (set_handler( SIGUSR1, (void (*)())usr1_handler ) == -1) goto error;
 559 #ifdef SIGBUS
 560     if (set_handler( SIGBUS,  (void (*)())segv_handler ) == -1) goto error;
 561 #endif
 562 #ifdef SIGTRAP
 563     if (set_handler( SIGTRAP, (void (*)())trap_handler ) == -1) goto error;
 564 #endif
 565     return;
 566
 567  error:
 568     perror("sigaction");
 569     exit(1);
 570 }
 571
 572
 573 /**********************************************************************
 574  *              RtlLookupFunctionEntry   (NTDLL.@)
 575  */
 576 PRUNTIME_FUNCTION WINAPI RtlLookupFunctionEntry( ULONG64 pc, ULONG64 *base,
 577                                                  UNWIND_HISTORY_TABLE *table )
 578 {
 579     FIXME("stub\n");
 580     return NULL;
 581 }
 582
 583
 584 /**********************************************************************
 585  *              RtlVirtualUnwind   (NTDLL.@)
 586  */
 587 PVOID WINAPI RtlVirtualUnwind ( ULONG type, ULONG64 base, ULONG64 pc,
 588                                 RUNTIME_FUNCTION *function, CONTEXT *context,
 589                                 PVOID *data, ULONG64 *frame,
 590                                 KNONVOLATILE_CONTEXT_POINTERS *ctx_ptr )
 591 {
 592     FIXME("stub\n");
 593     return NULL;
 594 }
 595
 596
 597 /**********************************************************************
 598  *              __wine_enter_vm86   (NTDLL.@)
 599  */
 600 void __wine_enter_vm86( CONTEXT *context )
 601 {
 602     MESSAGE("vm86 mode not supported on this platform\n");
 603 }
 604
 605 /**********************************************************************
 606  *              DbgBreakPoint   (NTDLL.@)
 607  */
 608 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret")
 609
 610 /**********************************************************************
 611  *              DbgUserBreakPoint   (NTDLL.@)
 612  */
 613 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret")
 614
 615 #endif  /* __x86_64__ */