2 * i386 signal handling routines
4 * Copyright 1999 Alexandre Julliard
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.
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.
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
24 #include "wine/port.h"
35 #ifdef HAVE_SYS_PARAM_H
36 # include <sys/param.h>
41 # ifdef HAVE_SYS_SYSCALL_H
42 # include <sys/syscall.h>
46 #ifdef HAVE_SYS_VM86_H
47 # include <sys/vm86.h>
50 #ifdef HAVE_SYS_SIGNAL_H
51 # include <sys/signal.h>
56 #include "wine/library.h"
57 #include "ntdll_misc.h"
59 #ifdef HAVE_VALGRIND_MEMCHECK_H
60 #include <valgrind/memcheck.h>
63 /***********************************************************************
64 * signal context platform-specific definitions
70 unsigned short sc_gs
, __gsh
;
71 unsigned short sc_fs
, __fsh
;
72 unsigned short sc_es
, __esh
;
73 unsigned short sc_ds
, __dsh
;
82 unsigned long sc_trapno
;
85 unsigned short sc_cs
, __csh
;
86 unsigned long sc_eflags
;
87 unsigned long esp_at_signal
;
88 unsigned short sc_ss
, __ssh
;
90 unsigned long oldmask
;
92 } volatile SIGCONTEXT
;
94 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
95 #define HANDLER_CONTEXT (&__context)
97 /* this is the sigaction structure from the Linux 2.1.20 kernel. */
98 struct kernel_sigaction
100 void (*ksa_handler
)();
101 unsigned long ksa_mask
;
102 unsigned long ksa_flags
;
106 #ifndef SYS_sigaction
107 # ifndef __NR_sigaction
108 # error The sigaction syscall is part of the Linux i386 ABI, but your headers does not define it. Please raise a bug with your distribution.
110 # define SYS_sigaction __NR_sigaction
113 /* Similar to the sigaction function in libc, except it leaves alone the
114 restorer field, which is used to specify the signal stack address */
115 static inline int wine_sigaction( int sig
, struct kernel_sigaction
*new,
116 struct kernel_sigaction
*old
)
118 __asm__
__volatile__( "pushl %%ebx\n\t"
123 : "0" (SYS_sigaction
), "S" (sig
), "c" (new), "d" (old
) );
124 if (sig
>=0) return 0;
129 #ifdef HAVE_SIGALTSTACK
130 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
131 static inline int wine_sigaltstack( const struct sigaltstack
*new,
132 struct sigaltstack
*old
)
135 __asm__
__volatile__( "pushl %%ebx\n\t"
140 : "0" (SYS_sigaltstack
), "q" (new), "c" (old
) );
141 if (ret
>= 0) return 0;
147 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
149 int vm86_enter( void **vm86_ptr
);
150 void vm86_return(void);
151 void vm86_return_end(void);
152 __ASM_GLOBAL_FUNC(vm86_enter
,
154 "movl %esp, %ebp\n\t"
155 "movl $166,%eax\n\t" /*SYS_vm86*/
156 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
157 "movl (%ecx),%ecx\n\t"
159 "movl $1,%ebx\n\t" /*VM86_ENTER*/
160 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
164 ".globl " __ASM_NAME("vm86_return") "\n\t"
165 __ASM_FUNC("vm86_return") "\n"
166 __ASM_NAME("vm86_return") ":\n\t"
172 "testl %eax,%eax\n\t"
174 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
175 "je " __ASM_NAME("vm86_enter") "\n\t"
177 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
179 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
180 __ASM_FUNC("vm86_return_end") "\n"
181 __ASM_NAME("vm86_return_end") ":\n\t"
184 #ifdef HAVE_SYS_VM86_H
192 #define EAX_sig(context) ((context)->tf_eax)
193 #define EBX_sig(context) ((context)->tf_ebx)
194 #define ECX_sig(context) ((context)->tf_ecx)
195 #define EDX_sig(context) ((context)->tf_edx)
196 #define ESI_sig(context) ((context)->tf_esi)
197 #define EDI_sig(context) ((context)->tf_edi)
198 #define EBP_sig(context) ((context)->tf_ebp)
200 #define CS_sig(context) ((context)->tf_cs)
201 #define DS_sig(context) ((context)->tf_ds)
202 #define ES_sig(context) ((context)->tf_es)
203 #define SS_sig(context) ((context)->tf_ss)
205 #include <machine/frame.h>
206 typedef struct trapframe SIGCONTEXT
;
208 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
209 #define HANDLER_CONTEXT __context
211 #define EFL_sig(context) ((context)->tf_eflags)
213 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
214 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
218 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
220 typedef struct sigcontext SIGCONTEXT
;
222 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
223 #define HANDLER_CONTEXT __context
227 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
230 #include <sys/regset.h>
234 #include <sys/ucontext.h>
236 typedef struct ucontext SIGCONTEXT
;
238 #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
239 #define HANDLER_CONTEXT __context
241 #endif /* svr4 || SCO_DS */
247 unsigned long ContextFlags
;
248 FLOATING_SAVE_AREA sc_float
;
253 unsigned long sc_edi
;
254 unsigned long sc_esi
;
255 unsigned long sc_eax
;
256 unsigned long sc_ebx
;
257 unsigned long sc_ecx
;
258 unsigned long sc_edx
;
259 unsigned long sc_ebp
;
260 unsigned long sc_eip
;
262 unsigned long sc_eflags
;
263 unsigned long sc_esp
;
271 /* FIXME: This section is just here so it can compile, it's most likely
272 * completely wrong. */
276 unsigned short sc_gs
, __gsh
;
277 unsigned short sc_fs
, __fsh
;
278 unsigned short sc_es
, __esh
;
279 unsigned short sc_ds
, __dsh
;
280 unsigned long sc_edi
;
281 unsigned long sc_esi
;
282 unsigned long sc_ebp
;
283 unsigned long sc_esp
;
284 unsigned long sc_ebx
;
285 unsigned long sc_edx
;
286 unsigned long sc_ecx
;
287 unsigned long sc_eax
;
288 unsigned long sc_trapno
;
289 unsigned long sc_err
;
290 unsigned long sc_eip
;
291 unsigned short sc_cs
, __csh
;
292 unsigned long sc_eflags
;
293 unsigned long esp_at_signal
;
294 unsigned short sc_ss
, __ssh
;
296 unsigned long oldmask
;
300 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
301 #define HANDLER_CONTEXT (&__context)
303 #endif /* __CYGWIN__ */
306 # include <sys/ucontext.h>
307 # include <sys/types.h>
310 typedef ucontext_t SIGCONTEXT
;
312 #define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
313 #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
314 #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
315 #define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
316 #define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
317 #define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
318 #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
320 #define CS_sig(context) ((context)->uc_mcontext->ss.cs)
321 #define DS_sig(context) ((context)->uc_mcontext->ss.ds)
322 #define ES_sig(context) ((context)->uc_mcontext->ss.es)
323 #define FS_sig(context) ((context)->uc_mcontext->ss.fs)
324 #define GS_sig(context) ((context)->uc_mcontext->ss.gs)
325 #define SS_sig(context) ((context)->uc_mcontext->ss.ss)
327 #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
329 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
330 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
332 #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
333 #define HANDLER_CONTEXT (__context)
335 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
336 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
338 #define FAULT_ADDRESS (__siginfo->si_addr)
340 #endif /* __APPLE__ */
342 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) ||\
343 defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
345 #define EAX_sig(context) ((context)->sc_eax)
346 #define EBX_sig(context) ((context)->sc_ebx)
347 #define ECX_sig(context) ((context)->sc_ecx)
348 #define EDX_sig(context) ((context)->sc_edx)
349 #define ESI_sig(context) ((context)->sc_esi)
350 #define EDI_sig(context) ((context)->sc_edi)
351 #define EBP_sig(context) ((context)->sc_ebp)
353 #define CS_sig(context) ((context)->sc_cs)
354 #define DS_sig(context) ((context)->sc_ds)
355 #define ES_sig(context) ((context)->sc_es)
356 #define FS_sig(context) ((context)->sc_fs)
357 #define GS_sig(context) ((context)->sc_gs)
358 #define SS_sig(context) ((context)->sc_ss)
360 #define TRAP_sig(context) ((context)->sc_trapno)
363 #define ERROR_sig(context) ((context)->sc_err)
367 #define ERROR_sig(context) ((context)->sc_err)
368 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
369 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
372 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
373 #define EFL_sig(context) ((context)->sc_efl)
374 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
375 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
377 #define EFL_sig(context) ((context)->sc_eflags)
380 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
381 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
383 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
385 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
391 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
392 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
393 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
394 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
395 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
396 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
397 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
399 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
400 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
401 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
402 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
404 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
405 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
407 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
409 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
411 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
413 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
415 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
418 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
421 #define FAULT_ADDRESS (__siginfo->si_addr)
423 #endif /* svr4 || SCO_DS */
425 #include "wine/exception.h"
426 #include "wine/debug.h"
428 WINE_DEFAULT_DEBUG_CHANNEL(seh
);
430 typedef int (*wine_signal_handler
)(unsigned int sig
);
432 static size_t signal_stack_mask
;
433 static size_t signal_stack_size
;
435 static wine_signal_handler handlers
[256];
437 extern void DECLSPEC_NORETURN
__wine_call_from_32_restore_regs( const CONTEXT
*context
);
441 TRAP_x86_UNKNOWN
= -1, /* Unknown fault (TRAP_sig not defined) */
442 TRAP_x86_DIVIDE
= 0, /* Division by zero exception */
443 TRAP_x86_TRCTRAP
= 1, /* Single-step exception */
444 TRAP_x86_NMI
= 2, /* NMI interrupt */
445 TRAP_x86_BPTFLT
= 3, /* Breakpoint exception */
446 TRAP_x86_OFLOW
= 4, /* Overflow exception */
447 TRAP_x86_BOUND
= 5, /* Bound range exception */
448 TRAP_x86_PRIVINFLT
= 6, /* Invalid opcode exception */
449 TRAP_x86_DNA
= 7, /* Device not available exception */
450 TRAP_x86_DOUBLEFLT
= 8, /* Double fault exception */
451 TRAP_x86_FPOPFLT
= 9, /* Coprocessor segment overrun */
452 TRAP_x86_TSSFLT
= 10, /* Invalid TSS exception */
453 TRAP_x86_SEGNPFLT
= 11, /* Segment not present exception */
454 TRAP_x86_STKFLT
= 12, /* Stack fault */
455 TRAP_x86_PROTFLT
= 13, /* General protection fault */
456 TRAP_x86_PAGEFLT
= 14, /* Page fault */
457 TRAP_x86_ARITHTRAP
= 16, /* Floating point exception */
458 TRAP_x86_ALIGNFLT
= 17, /* Alignment check exception */
459 TRAP_x86_MCHK
= 18, /* Machine check exception */
460 TRAP_x86_CACHEFLT
= 19 /* Cache flush exception */
464 /***********************************************************************
467 inline static int dispatch_signal(unsigned int sig
)
469 if (handlers
[sig
] == NULL
) return 0;
470 return handlers
[sig
](sig
);
474 /***********************************************************************
477 * Get the trap code for a signal.
479 static inline enum i386_trap_code
get_trap_code( const SIGCONTEXT
*sigcontext
)
482 return TRAP_sig(sigcontext
);
484 return TRAP_x86_UNKNOWN
; /* unknown trap code */
488 /***********************************************************************
491 * Get the error code for a signal.
493 static inline WORD
get_error_code( const SIGCONTEXT
*sigcontext
)
496 return ERROR_sig(sigcontext
);
502 /***********************************************************************
505 * Get the base of the signal stack for the current thread.
507 static inline void *get_signal_stack(void)
509 return (char *)NtCurrentTeb() + 4096;
513 /***********************************************************************
516 * Get the current teb based on the stack pointer.
518 static inline TEB
*get_current_teb(void)
521 __asm__("movl %%esp,%0" : "=g" (esp
) );
522 return (TEB
*)(esp
& ~signal_stack_mask
);
527 /***********************************************************************
530 * Set the register values from a vm86 structure.
532 static void save_vm86_context( CONTEXT
*context
, const struct vm86plus_struct
*vm86
)
534 context
->ContextFlags
= CONTEXT_FULL
;
535 context
->Eax
= vm86
->regs
.eax
;
536 context
->Ebx
= vm86
->regs
.ebx
;
537 context
->Ecx
= vm86
->regs
.ecx
;
538 context
->Edx
= vm86
->regs
.edx
;
539 context
->Esi
= vm86
->regs
.esi
;
540 context
->Edi
= vm86
->regs
.edi
;
541 context
->Esp
= vm86
->regs
.esp
;
542 context
->Ebp
= vm86
->regs
.ebp
;
543 context
->Eip
= vm86
->regs
.eip
;
544 context
->SegCs
= vm86
->regs
.cs
;
545 context
->SegDs
= vm86
->regs
.ds
;
546 context
->SegEs
= vm86
->regs
.es
;
547 context
->SegFs
= vm86
->regs
.fs
;
548 context
->SegGs
= vm86
->regs
.gs
;
549 context
->SegSs
= vm86
->regs
.ss
;
550 context
->EFlags
= vm86
->regs
.eflags
;
554 /***********************************************************************
555 * restore_vm86_context
557 * Build a vm86 structure from the register values.
559 static void restore_vm86_context( const CONTEXT
*context
, struct vm86plus_struct
*vm86
)
561 vm86
->regs
.eax
= context
->Eax
;
562 vm86
->regs
.ebx
= context
->Ebx
;
563 vm86
->regs
.ecx
= context
->Ecx
;
564 vm86
->regs
.edx
= context
->Edx
;
565 vm86
->regs
.esi
= context
->Esi
;
566 vm86
->regs
.edi
= context
->Edi
;
567 vm86
->regs
.esp
= context
->Esp
;
568 vm86
->regs
.ebp
= context
->Ebp
;
569 vm86
->regs
.eip
= context
->Eip
;
570 vm86
->regs
.cs
= context
->SegCs
;
571 vm86
->regs
.ds
= context
->SegDs
;
572 vm86
->regs
.es
= context
->SegEs
;
573 vm86
->regs
.fs
= context
->SegFs
;
574 vm86
->regs
.gs
= context
->SegGs
;
575 vm86
->regs
.ss
= context
->SegSs
;
576 vm86
->regs
.eflags
= context
->EFlags
;
580 /**********************************************************************
581 * merge_vm86_pending_flags
583 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
584 * raises exception if there are pending events and VIF flag
585 * has been turned on.
587 * Called from __wine_enter_vm86 because vm86_enter
588 * doesn't check for pending events.
590 * Called from raise_vm86_sti_exception to check for
591 * pending events in a signal safe way.
593 static void merge_vm86_pending_flags( EXCEPTION_RECORD
*rec
)
595 BOOL check_pending
= TRUE
;
596 struct vm86plus_struct
*vm86
=
597 (struct vm86plus_struct
*)(ntdll_get_thread_data()->vm86_ptr
);
600 * In order to prevent a race when SIGUSR2 occurs while
601 * we are returning from exception handler, pending events
602 * will be rechecked after each raised exception.
604 while (check_pending
&& NtCurrentTeb()->vm86_pending
)
606 check_pending
= FALSE
;
607 ntdll_get_thread_data()->vm86_ptr
= NULL
;
610 * If VIF is set, throw exception.
611 * Note that SIGUSR2 may turn VIF flag off so
612 * VIF check must occur only when TEB.vm86_ptr is NULL.
614 if (vm86
->regs
.eflags
& VIF_MASK
)
617 save_vm86_context( &vcontext
, vm86
);
619 rec
->ExceptionCode
= EXCEPTION_VM86_STI
;
620 rec
->ExceptionFlags
= EXCEPTION_CONTINUABLE
;
621 rec
->ExceptionRecord
= NULL
;
622 rec
->NumberParameters
= 0;
623 rec
->ExceptionAddress
= (LPVOID
)vcontext
.Eip
;
625 vcontext
.EFlags
&= ~VIP_MASK
;
626 NtCurrentTeb()->vm86_pending
= 0;
627 __regs_RtlRaiseException( rec
, &vcontext
);
629 restore_vm86_context( &vcontext
, vm86
);
630 check_pending
= TRUE
;
633 ntdll_get_thread_data()->vm86_ptr
= vm86
;
637 * Merge VIP flags in a signal safe way. This requires
638 * that the following operation compiles into atomic
641 vm86
->regs
.eflags
|= NtCurrentTeb()->vm86_pending
;
643 #endif /* __HAVE_VM86 */
646 typedef void (WINAPI
*raise_func
)( EXCEPTION_RECORD
*rec
, CONTEXT
*context
);
649 /***********************************************************************
652 * Handler initialization when the full context is not needed.
654 inline static void *init_handler( const SIGCONTEXT
*sigcontext
, WORD
*fs
, WORD
*gs
)
656 void *stack
= (void *)ESP_sig(sigcontext
);
657 TEB
*teb
= get_current_teb();
658 struct ntdll_thread_regs
*thread_regs
= (struct ntdll_thread_regs
*)teb
->SpareBytes1
;
660 /* get %fs and %gs at time of the fault */
662 *fs
= LOWORD(FS_sig(sigcontext
));
667 *gs
= LOWORD(GS_sig(sigcontext
));
672 wine_set_fs( thread_regs
->fs
);
674 /* now restore a proper %gs for the fault handler */
675 if (!wine_ldt_is_system(CS_sig(sigcontext
)) ||
676 !wine_ldt_is_system(SS_sig(sigcontext
))) /* 16-bit mode */
679 * Win16 or DOS protected mode. Note that during switch
680 * from 16-bit mode to linear mode, CS may be set to system
681 * segment before FS is restored. Fortunately, in this case
682 * SS is still non-system segment. This is why both CS and SS
685 wine_set_gs( thread_regs
->gs
);
686 stack
= teb
->WOW32Reserved
;
689 else if ((void *)EIP_sig(sigcontext
) == vm86_return
) /* vm86 mode */
691 unsigned int *int_stack
= stack
;
692 /* fetch the saved %gs from the stack */
693 wine_set_gs( int_stack
[0] );
696 else /* 32-bit mode */
699 wine_set_gs( GS_sig(sigcontext
) );
706 /***********************************************************************
709 * Save the thread FPU context.
711 inline static void save_fpu( CONTEXT
*context
)
714 context
->ContextFlags
|= CONTEXT_FLOATING_POINT
;
715 __asm__
__volatile__( "fnsave %0; fwait" : "=m" (context
->FloatSave
) );
720 /***********************************************************************
723 * Restore the FPU context to a sigcontext.
725 inline static void restore_fpu( const CONTEXT
*context
)
727 FLOATING_SAVE_AREA float_status
= context
->FloatSave
;
728 /* reset the current interrupt status */
729 float_status
.StatusWord
&= float_status
.ControlWord
| 0xffffff80;
731 __asm__
__volatile__( "frstor %0; fwait" : : "m" (float_status
) );
732 #endif /* __GNUC__ */
736 /***********************************************************************
739 * Build a context structure from the signal info.
741 inline static void save_context( CONTEXT
*context
, const SIGCONTEXT
*sigcontext
, WORD fs
, WORD gs
)
743 struct ntdll_thread_regs
* const regs
= ntdll_get_thread_regs();
745 memset(context
, 0, sizeof(*context
));
746 context
->ContextFlags
= CONTEXT_FULL
| CONTEXT_DEBUG_REGISTERS
;
747 context
->Eax
= EAX_sig(sigcontext
);
748 context
->Ebx
= EBX_sig(sigcontext
);
749 context
->Ecx
= ECX_sig(sigcontext
);
750 context
->Edx
= EDX_sig(sigcontext
);
751 context
->Esi
= ESI_sig(sigcontext
);
752 context
->Edi
= EDI_sig(sigcontext
);
753 context
->Ebp
= EBP_sig(sigcontext
);
754 context
->EFlags
= EFL_sig(sigcontext
);
755 context
->Eip
= EIP_sig(sigcontext
);
756 context
->Esp
= ESP_sig(sigcontext
);
757 context
->SegCs
= LOWORD(CS_sig(sigcontext
));
758 context
->SegDs
= LOWORD(DS_sig(sigcontext
));
759 context
->SegEs
= LOWORD(ES_sig(sigcontext
));
762 context
->SegSs
= LOWORD(SS_sig(sigcontext
));
763 context
->Dr0
= regs
->dr0
;
764 context
->Dr1
= regs
->dr1
;
765 context
->Dr2
= regs
->dr2
;
766 context
->Dr3
= regs
->dr3
;
767 context
->Dr6
= regs
->dr6
;
768 context
->Dr7
= regs
->dr7
;
771 if (FPU_sig(sigcontext
))
773 context
->ContextFlags
|= CONTEXT_FLOATING_POINT
;
774 context
->FloatSave
= *FPU_sig(sigcontext
);
784 /***********************************************************************
787 * Restore the signal info from the context.
789 inline static void restore_context( const CONTEXT
*context
, SIGCONTEXT
*sigcontext
)
791 struct ntdll_thread_regs
* const regs
= ntdll_get_thread_regs();
793 regs
->dr0
= context
->Dr0
;
794 regs
->dr1
= context
->Dr1
;
795 regs
->dr2
= context
->Dr2
;
796 regs
->dr3
= context
->Dr3
;
797 regs
->dr6
= context
->Dr6
;
798 regs
->dr7
= context
->Dr7
;
799 EAX_sig(sigcontext
) = context
->Eax
;
800 EBX_sig(sigcontext
) = context
->Ebx
;
801 ECX_sig(sigcontext
) = context
->Ecx
;
802 EDX_sig(sigcontext
) = context
->Edx
;
803 ESI_sig(sigcontext
) = context
->Esi
;
804 EDI_sig(sigcontext
) = context
->Edi
;
805 EBP_sig(sigcontext
) = context
->Ebp
;
806 EFL_sig(sigcontext
) = context
->EFlags
;
807 EIP_sig(sigcontext
) = context
->Eip
;
808 ESP_sig(sigcontext
) = context
->Esp
;
809 CS_sig(sigcontext
) = context
->SegCs
;
810 DS_sig(sigcontext
) = context
->SegDs
;
811 ES_sig(sigcontext
) = context
->SegEs
;
812 SS_sig(sigcontext
) = context
->SegSs
;
814 GS_sig(sigcontext
) = context
->SegGs
;
816 wine_set_gs( context
->SegGs
);
819 FS_sig(sigcontext
) = context
->SegFs
;
821 wine_set_fs( context
->SegFs
);
825 if (FPU_sig(sigcontext
))
827 *FPU_sig(sigcontext
) = context
->FloatSave
;
832 restore_fpu( context
);
837 /***********************************************************************
840 * Register function to get the context of the current thread.
842 void WINAPI
__regs_get_cpu_context( CONTEXT
*context
, CONTEXT
*regs
)
847 DEFINE_REGS_ENTRYPOINT( get_cpu_context
, 4, 4 );
850 /***********************************************************************
853 * Set the new CPU context. Used by NtSetContextThread.
855 void set_cpu_context( const CONTEXT
*context
)
857 DWORD flags
= context
->ContextFlags
& ~CONTEXT_i386
;
859 if (flags
& CONTEXT_FLOATING_POINT
) restore_fpu( context
);
861 if (flags
& CONTEXT_DEBUG_REGISTERS
)
863 struct ntdll_thread_regs
* const regs
= ntdll_get_thread_regs();
864 regs
->dr0
= context
->Dr0
;
865 regs
->dr1
= context
->Dr1
;
866 regs
->dr2
= context
->Dr2
;
867 regs
->dr3
= context
->Dr3
;
868 regs
->dr6
= context
->Dr6
;
869 regs
->dr7
= context
->Dr7
;
871 if (flags
& CONTEXT_FULL
)
873 if ((flags
& CONTEXT_FULL
) != (CONTEXT_FULL
& ~CONTEXT_i386
))
874 FIXME( "setting partial context (%lx) not supported\n", flags
);
876 __wine_call_from_32_restore_regs( context
);
881 /***********************************************************************
882 * is_privileged_instr
884 * Check if the fault location is a privileged instruction.
885 * Based on the instruction emulation code in dlls/kernel/instr.c.
887 static inline int is_privileged_instr( CONTEXT86
*context
)
890 unsigned int prefix_count
= 0;
892 if (!wine_ldt_is_system( context
->SegCs
)) return 0;
893 instr
= (BYTE
*)context
->Eip
;
895 for (;;) switch(*instr
)
897 /* instruction prefixes */
898 case 0x2e: /* %cs: */
899 case 0x36: /* %ss: */
900 case 0x3e: /* %ds: */
901 case 0x26: /* %es: */
902 case 0x64: /* %fs: */
903 case 0x65: /* %gs: */
904 case 0x66: /* opcode size */
905 case 0x67: /* addr size */
906 case 0xf0: /* lock */
907 case 0xf2: /* repne */
908 case 0xf3: /* repe */
909 if (++prefix_count
>= 15) return 0;
913 case 0x0f: /* extended instruction */
916 case 0x20: /* mov crX, reg */
917 case 0x21: /* mov drX, reg */
918 case 0x22: /* mov reg, crX */
919 case 0x23: /* mov reg drX */
923 case 0x6c: /* insb (%dx) */
924 case 0x6d: /* insl (%dx) */
925 case 0x6e: /* outsb (%dx) */
926 case 0x6f: /* outsl (%dx) */
927 case 0xcd: /* int $xx */
928 case 0xe4: /* inb al,XX */
929 case 0xe5: /* in (e)ax,XX */
930 case 0xe6: /* outb XX,al */
931 case 0xe7: /* out XX,(e)ax */
932 case 0xec: /* inb (%dx),%al */
933 case 0xed: /* inl (%dx),%eax */
934 case 0xee: /* outb %al,(%dx) */
935 case 0xef: /* outl %eax,(%dx) */
946 #include "pshpack1.h"
949 DWORD movl
; /* movl this,4(%esp) */
951 BYTE jmp
; /* jmp func */
956 /**********************************************************************
959 * Check if code destination is an ATL thunk, and emulate it if so.
961 static BOOL
check_atl_thunk( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
963 struct atl_thunk
*thunk
= (struct atl_thunk
*)rec
->ExceptionInformation
[1];
965 if (thunk
->movl
!= 0x042444c7 || thunk
->jmp
!= 0xe9) return FALSE
;
966 *((DWORD
*)context
->Esp
+ 1) = thunk
->this;
967 context
->Eip
= (DWORD_PTR
)(&thunk
->func
+ 1) + thunk
->func
;
968 TRACE( "emulating ATL thunk at %p, func=%08lx arg=%08lx\n",
969 thunk
, context
->Eip
, *((DWORD
*)context
->Esp
+ 1) );
974 /***********************************************************************
977 * Setup a proper stack frame for the raise function, and modify the
978 * sigcontext so that the return from the signal handler will call
979 * the raise function.
981 static EXCEPTION_RECORD
*setup_exception( SIGCONTEXT
*sigcontext
, raise_func func
)
985 void *ret_addr
; /* return address from raise_func */
986 EXCEPTION_RECORD
*rec_ptr
; /* first arg for raise_func */
987 CONTEXT
*context_ptr
; /* second arg for raise_func */
989 EXCEPTION_RECORD rec
;
996 stack
= init_handler( sigcontext
, &fs
, &gs
);
998 /* stack sanity checks */
1000 if ((char *)stack
>= (char *)get_signal_stack() &&
1001 (char *)stack
< (char *)get_signal_stack() + signal_stack_size
)
1003 ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
1004 GetCurrentThreadId(), EIP_sig(sigcontext
), ESP_sig(sigcontext
),
1005 NtCurrentTeb()->Tib
.StackLimit
, NtCurrentTeb()->Tib
.StackBase
);
1006 server_abort_thread(1);
1009 if (stack
- 1 > stack
|| /* check for overflow in subtraction */
1010 (char *)(stack
- 1) < (char *)NtCurrentTeb()->Tib
.StackLimit
||
1011 (char *)stack
> (char *)NtCurrentTeb()->Tib
.StackBase
)
1013 UINT diff
= (char *)NtCurrentTeb()->Tib
.StackLimit
- (char *)stack
;
1016 ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
1017 diff
, GetCurrentThreadId(), EIP_sig(sigcontext
), ESP_sig(sigcontext
),
1018 NtCurrentTeb()->Tib
.StackLimit
, NtCurrentTeb()->Tib
.StackBase
);
1019 server_abort_thread(1);
1021 else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
1022 GetCurrentThreadId(), EIP_sig(sigcontext
), ESP_sig(sigcontext
),
1023 NtCurrentTeb()->Tib
.StackLimit
, NtCurrentTeb()->Tib
.StackBase
);
1026 stack
--; /* push the stack_layout structure */
1027 #ifdef HAVE_VALGRIND_MEMCHECK_H
1028 VALGRIND_MAKE_WRITABLE(stack
, sizeof(*stack
));
1030 stack
->ret_addr
= (void *)0xdeadbabe; /* raise_func must not return */
1031 stack
->rec_ptr
= &stack
->rec
;
1032 stack
->context_ptr
= &stack
->context
;
1034 stack
->rec
.ExceptionRecord
= NULL
;
1035 stack
->rec
.ExceptionFlags
= EXCEPTION_CONTINUABLE
;
1036 stack
->rec
.ExceptionAddress
= (LPVOID
)EIP_sig(sigcontext
);
1037 stack
->rec
.NumberParameters
= 0;
1039 save_context( &stack
->context
, sigcontext
, fs
, gs
);
1041 /* now modify the sigcontext to return to the raise function */
1042 ESP_sig(sigcontext
) = (DWORD
)stack
;
1043 EIP_sig(sigcontext
) = (DWORD
)func
;
1044 EFL_sig(sigcontext
) &= ~0x100; /* clear single-step flag */
1045 CS_sig(sigcontext
) = wine_get_cs();
1046 DS_sig(sigcontext
) = wine_get_ds();
1047 ES_sig(sigcontext
) = wine_get_es();
1048 FS_sig(sigcontext
) = wine_get_fs();
1049 GS_sig(sigcontext
) = wine_get_gs();
1050 SS_sig(sigcontext
) = wine_get_ss();
1052 return stack
->rec_ptr
;
1056 /***********************************************************************
1057 * get_exception_context
1059 * Get a pointer to the context built by setup_exception.
1061 static inline CONTEXT
*get_exception_context( EXCEPTION_RECORD
*rec
)
1063 return (CONTEXT
*)rec
- 1; /* cf. stack_layout structure */
1067 /**********************************************************************
1070 * Get the FPU exception code from the FPU status.
1072 static inline DWORD
get_fpu_code( const CONTEXT
*context
)
1074 DWORD status
= context
->FloatSave
.StatusWord
;
1076 if (status
& 0x01) /* IE */
1078 if (status
& 0x40) /* SF */
1079 return EXCEPTION_FLT_STACK_CHECK
;
1081 return EXCEPTION_FLT_INVALID_OPERATION
;
1083 if (status
& 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND
; /* DE flag */
1084 if (status
& 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO
; /* ZE flag */
1085 if (status
& 0x08) return EXCEPTION_FLT_OVERFLOW
; /* OE flag */
1086 if (status
& 0x10) return EXCEPTION_FLT_UNDERFLOW
; /* UE flag */
1087 if (status
& 0x20) return EXCEPTION_FLT_INEXACT_RESULT
; /* PE flag */
1088 return EXCEPTION_FLT_INVALID_OPERATION
; /* generic error */
1092 /**********************************************************************
1093 * raise_segv_exception
1095 static void WINAPI
raise_segv_exception( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
1097 switch(rec
->ExceptionCode
)
1099 case EXCEPTION_ACCESS_VIOLATION
:
1100 if (rec
->NumberParameters
== 2)
1102 if ((rec
->ExceptionInformation
[0] == 8) && check_atl_thunk( rec
, context
)) goto done
;
1103 rec
->ExceptionCode
= VIRTUAL_HandleFault( (void *)rec
->ExceptionInformation
[1] );
1106 case EXCEPTION_DATATYPE_MISALIGNMENT
:
1107 /* FIXME: pass through exception handler first? */
1108 if (context
->EFlags
& 0x00040000)
1110 /* Disable AC flag, return */
1111 context
->EFlags
&= ~0x00040000;
1116 __regs_RtlRaiseException( rec
, context
);
1118 NtSetContextThread( GetCurrentThread(), context
);
1122 /**********************************************************************
1123 * raise_trap_exception
1125 static void WINAPI
raise_trap_exception( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
1127 if (rec
->ExceptionCode
== EXCEPTION_SINGLE_STEP
)
1129 if (context
->EFlags
& 0x100)
1131 context
->EFlags
&= ~0x100; /* clear single-step flag */
1133 else /* hardware breakpoint, fetch the debug registers */
1135 context
->ContextFlags
= CONTEXT_DEBUG_REGISTERS
;
1136 NtGetContextThread(GetCurrentThread(), context
);
1137 /* do we really have a bp from a debug register ?
1138 * if not, then someone did a kill(SIGTRAP) on us, and we
1139 * shall return a breakpoint, not a single step exception
1141 if (!(context
->Dr6
& 0xf)) rec
->ExceptionCode
= EXCEPTION_BREAKPOINT
;
1142 context
->ContextFlags
|= CONTEXT_FULL
; /* restore flags */
1146 __regs_RtlRaiseException( rec
, context
);
1147 NtSetContextThread( GetCurrentThread(), context
);
1151 /**********************************************************************
1154 * Generic raise function for exceptions that don't need special treatment.
1156 static void WINAPI
raise_exception( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
1158 __regs_RtlRaiseException( rec
, context
);
1159 NtSetContextThread( GetCurrentThread(), context
);
1164 /**********************************************************************
1165 * raise_vm86_sti_exception
1167 static void WINAPI
raise_vm86_sti_exception( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
1169 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1170 NtCurrentTeb()->vm86_pending
|= VIP_MASK
;
1172 if (ntdll_get_thread_data()->vm86_ptr
)
1174 if (((char*)context
->Eip
>= (char*)vm86_return
) &&
1175 ((char*)context
->Eip
<= (char*)vm86_return_end
) &&
1176 (VM86_TYPE(context
->Eax
) != VM86_SIGNAL
)) {
1177 /* exiting from VM86, can't throw */
1180 merge_vm86_pending_flags( rec
);
1182 else if (NtCurrentTeb()->dpmi_vif
&&
1183 !wine_ldt_is_system(context
->SegCs
) &&
1184 !wine_ldt_is_system(context
->SegSs
))
1186 /* Executing DPMI code and virtual interrupts are enabled. */
1187 NtCurrentTeb()->vm86_pending
= 0;
1188 __regs_RtlRaiseException( rec
, context
);
1191 NtSetContextThread( GetCurrentThread(), context
);
1195 /**********************************************************************
1198 * Handler for SIGUSR2.
1199 * We use it to signal that the running __wine_enter_vm86() should
1200 * immediately set VIP_MASK, causing pending events to be handled
1201 * as early as possible.
1203 static HANDLER_DEF(usr2_handler
)
1205 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_vm86_sti_exception
);
1206 rec
->ExceptionCode
= EXCEPTION_VM86_STI
;
1208 #endif /* __HAVE_VM86 */
1211 /**********************************************************************
1214 * Handler for SIGSEGV and related errors.
1216 static HANDLER_DEF(segv_handler
)
1218 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_segv_exception
);
1220 switch(get_trap_code(HANDLER_CONTEXT
))
1222 case TRAP_x86_OFLOW
: /* Overflow exception */
1223 rec
->ExceptionCode
= EXCEPTION_INT_OVERFLOW
;
1225 case TRAP_x86_BOUND
: /* Bound range exception */
1226 rec
->ExceptionCode
= EXCEPTION_ARRAY_BOUNDS_EXCEEDED
;
1228 case TRAP_x86_PRIVINFLT
: /* Invalid opcode exception */
1229 rec
->ExceptionCode
= EXCEPTION_ILLEGAL_INSTRUCTION
;
1231 case TRAP_x86_STKFLT
: /* Stack fault */
1232 rec
->ExceptionCode
= EXCEPTION_STACK_OVERFLOW
;
1234 case TRAP_x86_SEGNPFLT
: /* Segment not present exception */
1235 case TRAP_x86_PROTFLT
: /* General protection fault */
1236 case TRAP_x86_UNKNOWN
: /* Unknown fault code */
1237 if (!get_error_code(HANDLER_CONTEXT
) && is_privileged_instr( get_exception_context(rec
) ))
1238 rec
->ExceptionCode
= EXCEPTION_PRIV_INSTRUCTION
;
1241 WORD err
= get_error_code(HANDLER_CONTEXT
);
1242 rec
->ExceptionCode
= EXCEPTION_ACCESS_VIOLATION
;
1243 rec
->NumberParameters
= 2;
1244 rec
->ExceptionInformation
[0] = 0;
1245 /* if error contains a LDT selector, use that as fault address */
1246 rec
->ExceptionInformation
[1] = (err
& 7) == 4 ? (err
& ~7) : 0xffffffff;
1249 case TRAP_x86_PAGEFLT
: /* Page fault */
1250 rec
->ExceptionCode
= EXCEPTION_ACCESS_VIOLATION
;
1251 #ifdef FAULT_ADDRESS
1252 rec
->NumberParameters
= 2;
1253 rec
->ExceptionInformation
[0] = (get_error_code(HANDLER_CONTEXT
) >> 1) & 0x09;
1254 rec
->ExceptionInformation
[1] = (ULONG_PTR
)FAULT_ADDRESS
;
1257 case TRAP_x86_ALIGNFLT
: /* Alignment check exception */
1258 rec
->ExceptionCode
= EXCEPTION_DATATYPE_MISALIGNMENT
;
1261 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT
) );
1263 case TRAP_x86_NMI
: /* NMI interrupt */
1264 case TRAP_x86_DNA
: /* Device not available exception */
1265 case TRAP_x86_DOUBLEFLT
: /* Double fault exception */
1266 case TRAP_x86_TSSFLT
: /* Invalid TSS exception */
1267 case TRAP_x86_MCHK
: /* Machine check exception */
1268 case TRAP_x86_CACHEFLT
: /* Cache flush exception */
1269 rec
->ExceptionCode
= EXCEPTION_ILLEGAL_INSTRUCTION
;
1275 /**********************************************************************
1278 * Handler for SIGTRAP.
1280 static HANDLER_DEF(trap_handler
)
1282 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_trap_exception
);
1284 switch(get_trap_code(HANDLER_CONTEXT
))
1286 case TRAP_x86_TRCTRAP
: /* Single-step exception */
1287 rec
->ExceptionCode
= EXCEPTION_SINGLE_STEP
;
1289 case TRAP_x86_BPTFLT
: /* Breakpoint exception */
1290 rec
->ExceptionAddress
= (char *)rec
->ExceptionAddress
- 1; /* back up over the int3 instruction */
1293 rec
->ExceptionCode
= EXCEPTION_BREAKPOINT
;
1299 /**********************************************************************
1302 * Handler for SIGFPE.
1304 static HANDLER_DEF(fpe_handler
)
1306 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_exception
);
1309 context
= get_exception_context( rec
);
1311 switch(get_trap_code(HANDLER_CONTEXT
))
1313 case TRAP_x86_DIVIDE
: /* Division by zero exception */
1314 rec
->ExceptionCode
= EXCEPTION_INT_DIVIDE_BY_ZERO
;
1316 case TRAP_x86_FPOPFLT
: /* Coprocessor segment overrun */
1317 rec
->ExceptionCode
= EXCEPTION_FLT_INVALID_OPERATION
;
1319 case TRAP_x86_ARITHTRAP
: /* Floating point exception */
1320 case TRAP_x86_UNKNOWN
: /* Unknown fault code */
1321 rec
->ExceptionCode
= get_fpu_code( context
);
1324 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT
) );
1325 rec
->ExceptionCode
= EXCEPTION_FLT_INVALID_OPERATION
;
1331 /**********************************************************************
1334 * Handler for SIGINT.
1336 * FIXME: should not be calling external functions on the signal stack.
1338 static HANDLER_DEF(int_handler
)
1341 init_handler( HANDLER_CONTEXT
, &fs
, &gs
);
1342 if (!dispatch_signal(SIGINT
))
1344 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_exception
);
1345 rec
->ExceptionCode
= CONTROL_C_EXIT
;
1349 /**********************************************************************
1352 * Handler for SIGABRT.
1354 static HANDLER_DEF(abrt_handler
)
1356 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_exception
);
1357 rec
->ExceptionCode
= EXCEPTION_WINE_ASSERTION
;
1358 rec
->ExceptionFlags
= EH_NONCONTINUABLE
;
1362 /**********************************************************************
1365 * Handler for SIGTERM.
1367 static HANDLER_DEF(term_handler
)
1370 init_handler( HANDLER_CONTEXT
, &fs
, &gs
);
1371 server_abort_thread(0);
1375 /**********************************************************************
1378 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1380 static HANDLER_DEF(usr1_handler
)
1385 init_handler( HANDLER_CONTEXT
, &fs
, &gs
);
1386 save_context( &context
, HANDLER_CONTEXT
, fs
, gs
);
1387 wait_suspend( &context
);
1388 restore_context( &context
, HANDLER_CONTEXT
);
1392 /**********************************************************************
1393 * get_signal_stack_total_size
1395 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1396 * Must be a power of two.
1398 size_t get_signal_stack_total_size(void)
1400 static const size_t teb_size
= 4096; /* we reserve one page for the TEB */
1402 if (!signal_stack_size
)
1404 size_t size
= 4096, min_size
= teb_size
+ max( MINSIGSTKSZ
, 4096 );
1405 /* find the first power of two not smaller than min_size */
1406 while (size
< min_size
) size
*= 2;
1407 signal_stack_mask
= size
- 1;
1408 signal_stack_size
= size
- teb_size
;
1410 return signal_stack_size
+ teb_size
;
1414 /***********************************************************************
1417 * Set a signal handler
1419 static int set_handler( int sig
, int have_sigaltstack
, void (*func
)() )
1421 struct sigaction sig_act
;
1424 if (!have_sigaltstack
)
1426 struct kernel_sigaction sig_act
;
1427 sig_act
.ksa_handler
= func
;
1428 sig_act
.ksa_flags
= SA_RESTART
;
1429 sig_act
.ksa_mask
= (1 << (SIGINT
-1)) |
1430 (1 << (SIGUSR1
-1)) |
1432 /* point to the top of the signal stack */
1433 sig_act
.ksa_restorer
= (char *)get_signal_stack() + signal_stack_size
;
1434 return wine_sigaction( sig
, &sig_act
, NULL
);
1437 sig_act
.sa_handler
= func
;
1438 sigemptyset( &sig_act
.sa_mask
);
1439 sigaddset( &sig_act
.sa_mask
, SIGINT
);
1440 sigaddset( &sig_act
.sa_mask
, SIGUSR1
);
1441 sigaddset( &sig_act
.sa_mask
, SIGUSR2
);
1443 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
1444 sig_act
.sa_flags
= SA_RESTART
;
1445 #elif defined (__svr4__) || defined(_SCO_DS) || defined(__APPLE__)
1446 sig_act
.sa_flags
= SA_SIGINFO
| SA_RESTART
;
1448 sig_act
.sa_flags
= 0;
1452 if (have_sigaltstack
) sig_act
.sa_flags
|= SA_ONSTACK
;
1454 return sigaction( sig
, &sig_act
, NULL
);
1458 /***********************************************************************
1459 * __wine_set_signal_handler (NTDLL.@)
1461 int __wine_set_signal_handler(unsigned int sig
, wine_signal_handler wsh
)
1463 if (sig
>= sizeof(handlers
) / sizeof(handlers
[0])) return -1;
1464 if (handlers
[sig
] != NULL
) return -2;
1465 handlers
[sig
] = wsh
;
1470 /**********************************************************************
1473 BOOL
SIGNAL_Init(void)
1475 int have_sigaltstack
= 0;
1477 #ifdef HAVE_SIGALTSTACK
1478 struct sigaltstack ss
;
1479 ss
.ss_sp
= get_signal_stack();
1480 ss
.ss_size
= signal_stack_size
;
1482 if (!sigaltstack(&ss
, NULL
)) have_sigaltstack
= 1;
1484 /* sigaltstack may fail because the kernel is too old, or
1485 because glibc is brain-dead. In the latter case a
1486 direct system call should succeed. */
1487 else if (!wine_sigaltstack(&ss
, NULL
)) have_sigaltstack
= 1;
1489 #endif /* HAVE_SIGALTSTACK */
1491 if (set_handler( SIGINT
, have_sigaltstack
, (void (*)())int_handler
) == -1) goto error
;
1492 if (set_handler( SIGFPE
, have_sigaltstack
, (void (*)())fpe_handler
) == -1) goto error
;
1493 if (set_handler( SIGSEGV
, have_sigaltstack
, (void (*)())segv_handler
) == -1) goto error
;
1494 if (set_handler( SIGILL
, have_sigaltstack
, (void (*)())segv_handler
) == -1) goto error
;
1495 if (set_handler( SIGABRT
, have_sigaltstack
, (void (*)())abrt_handler
) == -1) goto error
;
1496 if (set_handler( SIGTERM
, have_sigaltstack
, (void (*)())term_handler
) == -1) goto error
;
1497 if (set_handler( SIGUSR1
, have_sigaltstack
, (void (*)())usr1_handler
) == -1) goto error
;
1499 if (set_handler( SIGBUS
, have_sigaltstack
, (void (*)())segv_handler
) == -1) goto error
;
1502 if (set_handler( SIGTRAP
, have_sigaltstack
, (void (*)())trap_handler
) == -1) goto error
;
1506 if (set_handler( SIGUSR2
, have_sigaltstack
, (void (*)())usr2_handler
) == -1) goto error
;
1512 perror("sigaction");
1518 /**********************************************************************
1519 * __wine_enter_vm86 (NTDLL.@)
1521 * Enter vm86 mode with the specified register context.
1523 void __wine_enter_vm86( CONTEXT
*context
)
1525 EXCEPTION_RECORD rec
;
1527 struct vm86plus_struct vm86
;
1529 memset( &vm86
, 0, sizeof(vm86
) );
1532 restore_vm86_context( context
, &vm86
);
1534 ntdll_get_thread_data()->vm86_ptr
= &vm86
;
1535 merge_vm86_pending_flags( &rec
);
1537 res
= vm86_enter( &ntdll_get_thread_data()->vm86_ptr
); /* uses and clears teb->vm86_ptr */
1544 save_vm86_context( context
, &vm86
);
1546 rec
.ExceptionFlags
= EXCEPTION_CONTINUABLE
;
1547 rec
.ExceptionRecord
= NULL
;
1548 rec
.ExceptionAddress
= (LPVOID
)context
->Eip
;
1549 rec
.NumberParameters
= 0;
1551 switch(VM86_TYPE(res
))
1553 case VM86_UNKNOWN
: /* unhandled GP fault - IO-instruction or similar */
1554 rec
.ExceptionCode
= EXCEPTION_PRIV_INSTRUCTION
;
1555 raise_segv_exception( &rec
, context
);
1557 case VM86_TRAP
: /* return due to DOS-debugger request */
1558 switch(VM86_ARG(res
))
1560 case TRAP_x86_TRCTRAP
: /* Single-step exception */
1561 rec
.ExceptionCode
= EXCEPTION_SINGLE_STEP
;
1563 case TRAP_x86_BPTFLT
: /* Breakpoint exception */
1564 rec
.ExceptionAddress
= (char *)rec
.ExceptionAddress
- 1; /* back up over the int3 instruction */
1567 rec
.ExceptionCode
= EXCEPTION_BREAKPOINT
;
1571 case VM86_INTx
: /* int3/int x instruction (ARG = x) */
1572 rec
.ExceptionCode
= EXCEPTION_VM86_INTx
;
1573 rec
.NumberParameters
= 1;
1574 rec
.ExceptionInformation
[0] = VM86_ARG(res
);
1576 case VM86_STI
: /* sti/popf/iret instruction enabled virtual interrupts */
1577 context
->EFlags
|= VIF_MASK
;
1578 context
->EFlags
&= ~VIP_MASK
;
1579 NtCurrentTeb()->vm86_pending
= 0;
1580 rec
.ExceptionCode
= EXCEPTION_VM86_STI
;
1582 case VM86_PICRETURN
: /* return due to pending PIC request */
1583 rec
.ExceptionCode
= EXCEPTION_VM86_PICRETURN
;
1585 case VM86_SIGNAL
: /* cannot happen because vm86_enter handles this case */
1587 ERR( "unhandled result from vm86 mode %x\n", res
);
1590 __regs_RtlRaiseException( &rec
, context
);
1594 #else /* __HAVE_VM86 */
1595 /**********************************************************************
1596 * __wine_enter_vm86 (NTDLL.@)
1598 void __wine_enter_vm86( CONTEXT
*context
)
1600 MESSAGE("vm86 mode not supported on this platform\n");
1602 #endif /* __HAVE_VM86 */
1604 /**********************************************************************
1605 * DbgBreakPoint (NTDLL.@)
1607 __ASM_GLOBAL_FUNC( DbgBreakPoint
, "int $3; ret");
1609 /**********************************************************************
1610 * DbgUserBreakPoint (NTDLL.@)
1612 __ASM_GLOBAL_FUNC( DbgUserBreakPoint
, "int $3; ret");
1615 /**********************************************************************
1616 * EXC_CallHandler (internal)
1618 * Some exception handlers depend on EBP to have a fixed position relative to
1619 * the exception frame.
1620 * Shrinker depends on (*1) doing what it does,
1621 * (*2) being the exact instruction it is and (*3) beginning with 0x64
1622 * (i.e. the %fs prefix to the movl instruction). It also depends on the
1623 * function calling the handler having only 5 parameters (*4).
1625 __ASM_GLOBAL_FUNC( EXC_CallHandler
,
1627 " movl %esp, %ebp\n"
1629 " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1635 " call " __ASM_NAME("call_exception_handler") "\n"
1639 __ASM_GLOBAL_FUNC(call_exception_handler
,
1641 " movl %esp, %ebp\n"
1643 " pushl 12(%ebp)\n" /* make any exceptions in this... */
1644 " pushl %edx\n" /* handler be handled by... */
1646 " pushl (0)\n" /* nested_handler (passed in edx). */
1648 " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
1653 " movl 24(%ebp), %ecx\n" /* (*1) */
1654 " call *%ecx\n" /* call handler. (*2) */
1656 " movl (0), %esp\n" /* restore previous... (*3) */
1658 " popl (0)\n" /* exception frame. */
1659 " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
1661 " ret $20\n" /* (*4) */
1663 #endif /* __i386__ */