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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 don't 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
->Eax
= vm86
->regs
.eax
;
535 context
->Ebx
= vm86
->regs
.ebx
;
536 context
->Ecx
= vm86
->regs
.ecx
;
537 context
->Edx
= vm86
->regs
.edx
;
538 context
->Esi
= vm86
->regs
.esi
;
539 context
->Edi
= vm86
->regs
.edi
;
540 context
->Esp
= vm86
->regs
.esp
;
541 context
->Ebp
= vm86
->regs
.ebp
;
542 context
->Eip
= vm86
->regs
.eip
;
543 context
->SegCs
= vm86
->regs
.cs
;
544 context
->SegDs
= vm86
->regs
.ds
;
545 context
->SegEs
= vm86
->regs
.es
;
546 context
->SegFs
= vm86
->regs
.fs
;
547 context
->SegGs
= vm86
->regs
.gs
;
548 context
->SegSs
= vm86
->regs
.ss
;
549 context
->EFlags
= vm86
->regs
.eflags
;
553 /***********************************************************************
554 * restore_vm86_context
556 * Build a vm86 structure from the register values.
558 static void restore_vm86_context( const CONTEXT
*context
, struct vm86plus_struct
*vm86
)
560 vm86
->regs
.eax
= context
->Eax
;
561 vm86
->regs
.ebx
= context
->Ebx
;
562 vm86
->regs
.ecx
= context
->Ecx
;
563 vm86
->regs
.edx
= context
->Edx
;
564 vm86
->regs
.esi
= context
->Esi
;
565 vm86
->regs
.edi
= context
->Edi
;
566 vm86
->regs
.esp
= context
->Esp
;
567 vm86
->regs
.ebp
= context
->Ebp
;
568 vm86
->regs
.eip
= context
->Eip
;
569 vm86
->regs
.cs
= context
->SegCs
;
570 vm86
->regs
.ds
= context
->SegDs
;
571 vm86
->regs
.es
= context
->SegEs
;
572 vm86
->regs
.fs
= context
->SegFs
;
573 vm86
->regs
.gs
= context
->SegGs
;
574 vm86
->regs
.ss
= context
->SegSs
;
575 vm86
->regs
.eflags
= context
->EFlags
;
579 /**********************************************************************
580 * merge_vm86_pending_flags
582 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
583 * raises exception if there are pending events and VIF flag
584 * has been turned on.
586 * Called from __wine_enter_vm86 because vm86_enter
587 * doesn't check for pending events.
589 * Called from raise_vm86_sti_exception to check for
590 * pending events in a signal safe way.
592 static void merge_vm86_pending_flags( EXCEPTION_RECORD
*rec
)
594 BOOL check_pending
= TRUE
;
595 struct vm86plus_struct
*vm86
=
596 (struct vm86plus_struct
*)(ntdll_get_thread_data()->vm86_ptr
);
599 * In order to prevent a race when SIGUSR2 occurs while
600 * we are returning from exception handler, pending events
601 * will be rechecked after each raised exception.
603 while (check_pending
&& NtCurrentTeb()->vm86_pending
)
605 check_pending
= FALSE
;
606 ntdll_get_thread_data()->vm86_ptr
= NULL
;
609 * If VIF is set, throw exception.
610 * Note that SIGUSR2 may turn VIF flag off so
611 * VIF check must occur only when TEB.vm86_ptr is NULL.
613 if (vm86
->regs
.eflags
& VIF_MASK
)
616 save_vm86_context( &vcontext
, vm86
);
618 rec
->ExceptionCode
= EXCEPTION_VM86_STI
;
619 rec
->ExceptionFlags
= EXCEPTION_CONTINUABLE
;
620 rec
->ExceptionRecord
= NULL
;
621 rec
->NumberParameters
= 0;
622 rec
->ExceptionAddress
= (LPVOID
)vcontext
.Eip
;
624 vcontext
.EFlags
&= ~VIP_MASK
;
625 NtCurrentTeb()->vm86_pending
= 0;
626 __regs_RtlRaiseException( rec
, &vcontext
);
628 restore_vm86_context( &vcontext
, vm86
);
629 check_pending
= TRUE
;
632 ntdll_get_thread_data()->vm86_ptr
= vm86
;
636 * Merge VIP flags in a signal safe way. This requires
637 * that the following operation compiles into atomic
640 vm86
->regs
.eflags
|= NtCurrentTeb()->vm86_pending
;
642 #endif /* __HAVE_VM86 */
645 typedef void (WINAPI
*raise_func
)( EXCEPTION_RECORD
*rec
, CONTEXT
*context
);
648 /***********************************************************************
651 * Handler initialization when the full context is not needed.
653 inline static void *init_handler( const SIGCONTEXT
*sigcontext
, WORD
*fs
, WORD
*gs
)
655 void *stack
= (void *)ESP_sig(sigcontext
);
656 TEB
*teb
= get_current_teb();
657 struct ntdll_thread_regs
*thread_regs
= (struct ntdll_thread_regs
*)teb
->SpareBytes1
;
659 /* get %fs and %gs at time of the fault */
661 *fs
= LOWORD(FS_sig(sigcontext
));
666 *gs
= LOWORD(GS_sig(sigcontext
));
671 wine_set_fs( thread_regs
->fs
);
673 /* now restore a proper %gs for the fault handler */
674 if (!wine_ldt_is_system(CS_sig(sigcontext
)) ||
675 !wine_ldt_is_system(SS_sig(sigcontext
))) /* 16-bit mode */
678 * Win16 or DOS protected mode. Note that during switch
679 * from 16-bit mode to linear mode, CS may be set to system
680 * segment before FS is restored. Fortunately, in this case
681 * SS is still non-system segment. This is why both CS and SS
684 wine_set_gs( thread_regs
->gs
);
685 stack
= teb
->WOW32Reserved
;
688 else if ((void *)EIP_sig(sigcontext
) == vm86_return
) /* vm86 mode */
690 unsigned int *int_stack
= stack
;
691 /* fetch the saved %gs from the stack */
692 wine_set_gs( int_stack
[0] );
695 else /* 32-bit mode */
698 wine_set_gs( GS_sig(sigcontext
) );
705 /***********************************************************************
708 * Set the FPU context from a sigcontext.
710 inline static void save_fpu( CONTEXT
*context
, const SIGCONTEXT
*sigcontext
)
712 context
->ContextFlags
|= CONTEXT86_FLOATING_POINT
;
714 if (FPU_sig(sigcontext
))
716 context
->FloatSave
= *FPU_sig(sigcontext
);
721 __asm__
__volatile__( "fnsave %0; fwait" : "=m" (context
->FloatSave
) );
722 #endif /* __GNUC__ */
726 /***********************************************************************
729 * Restore the FPU context to a sigcontext.
731 inline static void restore_fpu( const CONTEXT
*context
)
733 FLOATING_SAVE_AREA float_status
= context
->FloatSave
;
734 /* reset the current interrupt status */
735 float_status
.StatusWord
&= float_status
.ControlWord
| 0xffffff80;
737 __asm__
__volatile__( "frstor %0; fwait" : : "m" (float_status
) );
738 #endif /* __GNUC__ */
742 /***********************************************************************
745 * Build a context structure from the signal info.
747 inline static void save_context( CONTEXT
*context
, const SIGCONTEXT
*sigcontext
, WORD fs
, WORD gs
)
749 struct ntdll_thread_regs
* const regs
= ntdll_get_thread_regs();
751 memset(context
, 0, sizeof(*context
));
752 context
->ContextFlags
= CONTEXT_FULL
| CONTEXT_DEBUG_REGISTERS
;
753 context
->Eax
= EAX_sig(sigcontext
);
754 context
->Ebx
= EBX_sig(sigcontext
);
755 context
->Ecx
= ECX_sig(sigcontext
);
756 context
->Edx
= EDX_sig(sigcontext
);
757 context
->Esi
= ESI_sig(sigcontext
);
758 context
->Edi
= EDI_sig(sigcontext
);
759 context
->Ebp
= EBP_sig(sigcontext
);
760 context
->EFlags
= EFL_sig(sigcontext
);
761 context
->Eip
= EIP_sig(sigcontext
);
762 context
->Esp
= ESP_sig(sigcontext
);
763 context
->SegCs
= LOWORD(CS_sig(sigcontext
));
764 context
->SegDs
= LOWORD(DS_sig(sigcontext
));
765 context
->SegEs
= LOWORD(ES_sig(sigcontext
));
768 context
->SegSs
= LOWORD(SS_sig(sigcontext
));
769 context
->Dr0
= regs
->dr0
;
770 context
->Dr1
= regs
->dr1
;
771 context
->Dr2
= regs
->dr2
;
772 context
->Dr3
= regs
->dr3
;
773 context
->Dr6
= regs
->dr6
;
774 context
->Dr7
= regs
->dr7
;
778 /***********************************************************************
781 * Restore the signal info from the context.
783 inline static void restore_context( const CONTEXT
*context
, SIGCONTEXT
*sigcontext
)
785 struct ntdll_thread_regs
* const regs
= ntdll_get_thread_regs();
787 regs
->dr0
= context
->Dr0
;
788 regs
->dr1
= context
->Dr1
;
789 regs
->dr2
= context
->Dr2
;
790 regs
->dr3
= context
->Dr3
;
791 regs
->dr6
= context
->Dr6
;
792 regs
->dr7
= context
->Dr7
;
793 EAX_sig(sigcontext
) = context
->Eax
;
794 EBX_sig(sigcontext
) = context
->Ebx
;
795 ECX_sig(sigcontext
) = context
->Ecx
;
796 EDX_sig(sigcontext
) = context
->Edx
;
797 ESI_sig(sigcontext
) = context
->Esi
;
798 EDI_sig(sigcontext
) = context
->Edi
;
799 EBP_sig(sigcontext
) = context
->Ebp
;
800 EFL_sig(sigcontext
) = context
->EFlags
;
801 EIP_sig(sigcontext
) = context
->Eip
;
802 ESP_sig(sigcontext
) = context
->Esp
;
803 CS_sig(sigcontext
) = context
->SegCs
;
804 DS_sig(sigcontext
) = context
->SegDs
;
805 ES_sig(sigcontext
) = context
->SegEs
;
806 SS_sig(sigcontext
) = context
->SegSs
;
808 GS_sig(sigcontext
) = context
->SegGs
;
810 wine_set_gs( context
->SegGs
);
813 FS_sig(sigcontext
) = context
->SegFs
;
815 wine_set_fs( context
->SegFs
);
820 /***********************************************************************
823 * Set the new CPU context. Used by NtSetContextThread.
825 void set_cpu_context( const CONTEXT
*context
)
827 DWORD flags
= context
->ContextFlags
& ~CONTEXT_i386
;
829 if (flags
& CONTEXT_FLOATING_POINT
) restore_fpu( context
);
831 if (flags
& CONTEXT_DEBUG_REGISTERS
)
833 struct ntdll_thread_regs
* const regs
= ntdll_get_thread_regs();
834 regs
->dr0
= context
->Dr0
;
835 regs
->dr1
= context
->Dr1
;
836 regs
->dr2
= context
->Dr2
;
837 regs
->dr3
= context
->Dr3
;
838 regs
->dr6
= context
->Dr6
;
839 regs
->dr7
= context
->Dr7
;
841 if (flags
& CONTEXT_FULL
)
843 if ((flags
& CONTEXT_FULL
) != (CONTEXT_FULL
& ~CONTEXT_i386
))
844 FIXME( "setting partial context (%lx) not supported\n", flags
);
846 __wine_call_from_32_restore_regs( context
);
851 /***********************************************************************
852 * is_privileged_instr
854 * Check if the fault location is a privileged instruction.
855 * Based on the instruction emulation code in dlls/kernel/instr.c.
857 static inline int is_privileged_instr( CONTEXT86
*context
)
860 unsigned int prefix_count
= 0;
862 if (!wine_ldt_is_system( context
->SegCs
)) return 0;
863 instr
= (BYTE
*)context
->Eip
;
865 for (;;) switch(*instr
)
867 /* instruction prefixes */
868 case 0x2e: /* %cs: */
869 case 0x36: /* %ss: */
870 case 0x3e: /* %ds: */
871 case 0x26: /* %es: */
872 case 0x64: /* %fs: */
873 case 0x65: /* %gs: */
874 case 0x66: /* opcode size */
875 case 0x67: /* addr size */
876 case 0xf0: /* lock */
877 case 0xf2: /* repne */
878 case 0xf3: /* repe */
879 if (++prefix_count
>= 15) return 0;
883 case 0x0f: /* extended instruction */
886 case 0x20: /* mov crX, reg */
887 case 0x21: /* mov drX, reg */
888 case 0x22: /* mov reg, crX */
889 case 0x23: /* mov reg drX */
893 case 0x6c: /* insb (%dx) */
894 case 0x6d: /* insl (%dx) */
895 case 0x6e: /* outsb (%dx) */
896 case 0x6f: /* outsl (%dx) */
897 case 0xcd: /* int $xx */
898 case 0xe4: /* inb al,XX */
899 case 0xe5: /* in (e)ax,XX */
900 case 0xe6: /* outb XX,al */
901 case 0xe7: /* out XX,(e)ax */
902 case 0xec: /* inb (%dx),%al */
903 case 0xed: /* inl (%dx),%eax */
904 case 0xee: /* outb %al,(%dx) */
905 case 0xef: /* outl %eax,(%dx) */
916 #include "pshpack1.h"
919 DWORD movl
; /* movl this,4(%esp) */
921 BYTE jmp
; /* jmp func */
926 /**********************************************************************
929 * Check if code destination is an ATL thunk, and emulate it if so.
931 static BOOL
check_atl_thunk( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
933 struct atl_thunk
*thunk
= (struct atl_thunk
*)rec
->ExceptionInformation
[1];
935 if (thunk
->movl
!= 0x042444c7 || thunk
->jmp
!= 0xe9) return FALSE
;
936 *((DWORD
*)context
->Esp
+ 1) = thunk
->this;
937 context
->Eip
= (DWORD_PTR
)(&thunk
->func
+ 1) + thunk
->func
;
938 TRACE( "emulating ATL thunk at %p, func=%08lx arg=%08lx\n",
939 thunk
, context
->Eip
, *((DWORD
*)context
->Esp
+ 1) );
944 /***********************************************************************
947 * Setup a proper stack frame for the raise function, and modify the
948 * sigcontext so that the return from the signal handler will call
949 * the raise function.
951 static EXCEPTION_RECORD
*setup_exception( SIGCONTEXT
*sigcontext
, raise_func func
)
955 void *ret_addr
; /* return address from raise_func */
956 EXCEPTION_RECORD
*rec_ptr
; /* first arg for raise_func */
957 CONTEXT
*context_ptr
; /* second arg for raise_func */
959 EXCEPTION_RECORD rec
;
966 stack
= init_handler( sigcontext
, &fs
, &gs
);
968 /* stack sanity checks */
970 if ((char *)stack
>= (char *)get_signal_stack() &&
971 (char *)stack
< (char *)get_signal_stack() + signal_stack_size
)
973 ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
974 GetCurrentThreadId(), EIP_sig(sigcontext
), ESP_sig(sigcontext
),
975 NtCurrentTeb()->Tib
.StackLimit
, NtCurrentTeb()->Tib
.StackBase
);
976 server_abort_thread(1);
979 if (stack
- 1 > stack
|| /* check for overflow in subtraction */
980 (char *)(stack
- 1) < (char *)NtCurrentTeb()->Tib
.StackLimit
||
981 (char *)stack
> (char *)NtCurrentTeb()->Tib
.StackBase
)
983 UINT diff
= (char *)NtCurrentTeb()->Tib
.StackLimit
- (char *)stack
;
986 ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
987 diff
, GetCurrentThreadId(), EIP_sig(sigcontext
), ESP_sig(sigcontext
),
988 NtCurrentTeb()->Tib
.StackLimit
, NtCurrentTeb()->Tib
.StackBase
);
989 server_abort_thread(1);
991 else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
992 GetCurrentThreadId(), EIP_sig(sigcontext
), ESP_sig(sigcontext
),
993 NtCurrentTeb()->Tib
.StackLimit
, NtCurrentTeb()->Tib
.StackBase
);
996 stack
--; /* push the stack_layout structure */
997 #ifdef HAVE_VALGRIND_MEMCHECK_H
998 VALGRIND_MAKE_WRITABLE(stack
, sizeof(*stack
));
1000 stack
->ret_addr
= (void *)0xdeadbabe; /* raise_func must not return */
1001 stack
->rec_ptr
= &stack
->rec
;
1002 stack
->context_ptr
= &stack
->context
;
1004 stack
->rec
.ExceptionRecord
= NULL
;
1005 stack
->rec
.ExceptionFlags
= EXCEPTION_CONTINUABLE
;
1006 stack
->rec
.ExceptionAddress
= (LPVOID
)EIP_sig(sigcontext
);
1007 stack
->rec
.NumberParameters
= 0;
1009 save_context( &stack
->context
, sigcontext
, fs
, gs
);
1011 /* now modify the sigcontext to return to the raise function */
1012 ESP_sig(sigcontext
) = (DWORD
)stack
;
1013 EIP_sig(sigcontext
) = (DWORD
)func
;
1014 EFL_sig(sigcontext
) &= ~0x100; /* clear single-step flag */
1015 CS_sig(sigcontext
) = wine_get_cs();
1016 DS_sig(sigcontext
) = wine_get_ds();
1017 ES_sig(sigcontext
) = wine_get_es();
1018 FS_sig(sigcontext
) = wine_get_fs();
1019 GS_sig(sigcontext
) = wine_get_gs();
1020 SS_sig(sigcontext
) = wine_get_ss();
1022 return stack
->rec_ptr
;
1026 /***********************************************************************
1027 * get_exception_context
1029 * Get a pointer to the context built by setup_exception.
1031 static inline CONTEXT
*get_exception_context( EXCEPTION_RECORD
*rec
)
1033 return (CONTEXT
*)rec
- 1; /* cf. stack_layout structure */
1037 /**********************************************************************
1040 * Get the FPU exception code from the FPU status.
1042 static inline DWORD
get_fpu_code( const CONTEXT
*context
)
1044 DWORD status
= context
->FloatSave
.StatusWord
;
1046 if (status
& 0x01) /* IE */
1048 if (status
& 0x40) /* SF */
1049 return EXCEPTION_FLT_STACK_CHECK
;
1051 return EXCEPTION_FLT_INVALID_OPERATION
;
1053 if (status
& 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND
; /* DE flag */
1054 if (status
& 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO
; /* ZE flag */
1055 if (status
& 0x08) return EXCEPTION_FLT_OVERFLOW
; /* OE flag */
1056 if (status
& 0x10) return EXCEPTION_FLT_UNDERFLOW
; /* UE flag */
1057 if (status
& 0x20) return EXCEPTION_FLT_INEXACT_RESULT
; /* PE flag */
1058 return EXCEPTION_FLT_INVALID_OPERATION
; /* generic error */
1062 /**********************************************************************
1063 * raise_segv_exception
1065 static void WINAPI
raise_segv_exception( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
1067 switch(rec
->ExceptionCode
)
1069 case EXCEPTION_ACCESS_VIOLATION
:
1070 if (rec
->NumberParameters
== 2)
1072 if ((rec
->ExceptionInformation
[0] == 8) && check_atl_thunk( rec
, context
)) goto done
;
1073 rec
->ExceptionCode
= VIRTUAL_HandleFault( (void *)rec
->ExceptionInformation
[1] );
1076 case EXCEPTION_DATATYPE_MISALIGNMENT
:
1077 /* FIXME: pass through exception handler first? */
1078 if (context
->EFlags
& 0x00040000)
1080 /* Disable AC flag, return */
1081 context
->EFlags
&= ~0x00040000;
1086 __regs_RtlRaiseException( rec
, context
);
1088 NtSetContextThread( GetCurrentThread(), context
);
1092 /**********************************************************************
1093 * raise_trap_exception
1095 static void WINAPI
raise_trap_exception( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
1097 if (rec
->ExceptionCode
== EXCEPTION_SINGLE_STEP
)
1099 if (context
->EFlags
& 0x100)
1101 context
->EFlags
&= ~0x100; /* clear single-step flag */
1103 else /* hardware breakpoint, fetch the debug registers */
1105 context
->ContextFlags
= CONTEXT_DEBUG_REGISTERS
;
1106 NtGetContextThread(GetCurrentThread(), context
);
1107 /* do we really have a bp from a debug register ?
1108 * if not, then someone did a kill(SIGTRAP) on us, and we
1109 * shall return a breakpoint, not a single step exception
1111 if (!(context
->Dr6
& 0xf)) rec
->ExceptionCode
= EXCEPTION_BREAKPOINT
;
1112 context
->ContextFlags
|= CONTEXT_FULL
; /* restore flags */
1116 __regs_RtlRaiseException( rec
, context
);
1117 NtSetContextThread( GetCurrentThread(), context
);
1121 /**********************************************************************
1124 * Generic raise function for exceptions that don't need special treatment.
1126 static void WINAPI
raise_exception( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
1128 __regs_RtlRaiseException( rec
, context
);
1129 NtSetContextThread( GetCurrentThread(), context
);
1134 /**********************************************************************
1135 * raise_vm86_sti_exception
1137 static void WINAPI
raise_vm86_sti_exception( EXCEPTION_RECORD
*rec
, CONTEXT
*context
)
1139 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1140 NtCurrentTeb()->vm86_pending
|= VIP_MASK
;
1142 if (ntdll_get_thread_data()->vm86_ptr
)
1144 if (((char*)context
->Eip
>= (char*)vm86_return
) &&
1145 ((char*)context
->Eip
<= (char*)vm86_return_end
) &&
1146 (VM86_TYPE(context
->Eax
) != VM86_SIGNAL
)) {
1147 /* exiting from VM86, can't throw */
1150 merge_vm86_pending_flags( rec
);
1152 else if (NtCurrentTeb()->dpmi_vif
&&
1153 !wine_ldt_is_system(context
->SegCs
) &&
1154 !wine_ldt_is_system(context
->SegSs
))
1156 /* Executing DPMI code and virtual interrupts are enabled. */
1157 NtCurrentTeb()->vm86_pending
= 0;
1158 __regs_RtlRaiseException( rec
, context
);
1161 NtSetContextThread( GetCurrentThread(), context
);
1165 /**********************************************************************
1168 * Handler for SIGUSR2.
1169 * We use it to signal that the running __wine_enter_vm86() should
1170 * immediately set VIP_MASK, causing pending events to be handled
1171 * as early as possible.
1173 static HANDLER_DEF(usr2_handler
)
1175 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_vm86_sti_exception
);
1176 rec
->ExceptionCode
= EXCEPTION_VM86_STI
;
1178 #endif /* __HAVE_VM86 */
1181 /**********************************************************************
1184 * Handler for SIGSEGV and related errors.
1186 static HANDLER_DEF(segv_handler
)
1188 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_segv_exception
);
1190 switch(get_trap_code(HANDLER_CONTEXT
))
1192 case TRAP_x86_OFLOW
: /* Overflow exception */
1193 rec
->ExceptionCode
= EXCEPTION_INT_OVERFLOW
;
1195 case TRAP_x86_BOUND
: /* Bound range exception */
1196 rec
->ExceptionCode
= EXCEPTION_ARRAY_BOUNDS_EXCEEDED
;
1198 case TRAP_x86_PRIVINFLT
: /* Invalid opcode exception */
1199 rec
->ExceptionCode
= EXCEPTION_ILLEGAL_INSTRUCTION
;
1201 case TRAP_x86_STKFLT
: /* Stack fault */
1202 rec
->ExceptionCode
= EXCEPTION_STACK_OVERFLOW
;
1204 case TRAP_x86_SEGNPFLT
: /* Segment not present exception */
1205 case TRAP_x86_PROTFLT
: /* General protection fault */
1206 case TRAP_x86_UNKNOWN
: /* Unknown fault code */
1207 if (!get_error_code(HANDLER_CONTEXT
) && is_privileged_instr( get_exception_context(rec
) ))
1208 rec
->ExceptionCode
= EXCEPTION_PRIV_INSTRUCTION
;
1211 WORD err
= get_error_code(HANDLER_CONTEXT
);
1212 rec
->ExceptionCode
= EXCEPTION_ACCESS_VIOLATION
;
1213 rec
->NumberParameters
= 2;
1214 rec
->ExceptionInformation
[0] = 0;
1215 /* if error contains a LDT selector, use that as fault address */
1216 rec
->ExceptionInformation
[1] = (err
& 7) == 4 ? (err
& ~7) : 0xffffffff;
1219 case TRAP_x86_PAGEFLT
: /* Page fault */
1220 rec
->ExceptionCode
= EXCEPTION_ACCESS_VIOLATION
;
1221 #ifdef FAULT_ADDRESS
1222 rec
->NumberParameters
= 2;
1223 rec
->ExceptionInformation
[0] = (get_error_code(HANDLER_CONTEXT
) >> 1) & 0x09;
1224 rec
->ExceptionInformation
[1] = (ULONG_PTR
)FAULT_ADDRESS
;
1227 case TRAP_x86_ALIGNFLT
: /* Alignment check exception */
1228 rec
->ExceptionCode
= EXCEPTION_DATATYPE_MISALIGNMENT
;
1231 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT
) );
1233 case TRAP_x86_NMI
: /* NMI interrupt */
1234 case TRAP_x86_DNA
: /* Device not available exception */
1235 case TRAP_x86_DOUBLEFLT
: /* Double fault exception */
1236 case TRAP_x86_TSSFLT
: /* Invalid TSS exception */
1237 case TRAP_x86_MCHK
: /* Machine check exception */
1238 case TRAP_x86_CACHEFLT
: /* Cache flush exception */
1239 rec
->ExceptionCode
= EXCEPTION_ILLEGAL_INSTRUCTION
;
1245 /**********************************************************************
1248 * Handler for SIGTRAP.
1250 static HANDLER_DEF(trap_handler
)
1252 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_trap_exception
);
1254 switch(get_trap_code(HANDLER_CONTEXT
))
1256 case TRAP_x86_TRCTRAP
: /* Single-step exception */
1257 rec
->ExceptionCode
= EXCEPTION_SINGLE_STEP
;
1259 case TRAP_x86_BPTFLT
: /* Breakpoint exception */
1260 rec
->ExceptionAddress
= (char *)rec
->ExceptionAddress
- 1; /* back up over the int3 instruction */
1263 rec
->ExceptionCode
= EXCEPTION_BREAKPOINT
;
1269 /**********************************************************************
1272 * Handler for SIGFPE.
1274 static HANDLER_DEF(fpe_handler
)
1276 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_exception
);
1279 context
= get_exception_context( rec
);
1280 save_fpu( context
, HANDLER_CONTEXT
);
1282 switch(get_trap_code(HANDLER_CONTEXT
))
1284 case TRAP_x86_DIVIDE
: /* Division by zero exception */
1285 rec
->ExceptionCode
= EXCEPTION_INT_DIVIDE_BY_ZERO
;
1287 case TRAP_x86_FPOPFLT
: /* Coprocessor segment overrun */
1288 rec
->ExceptionCode
= EXCEPTION_FLT_INVALID_OPERATION
;
1290 case TRAP_x86_ARITHTRAP
: /* Floating point exception */
1291 case TRAP_x86_UNKNOWN
: /* Unknown fault code */
1292 rec
->ExceptionCode
= get_fpu_code( context
);
1295 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT
) );
1296 rec
->ExceptionCode
= EXCEPTION_FLT_INVALID_OPERATION
;
1302 /**********************************************************************
1305 * Handler for SIGINT.
1307 * FIXME: should not be calling external functions on the signal stack.
1309 static HANDLER_DEF(int_handler
)
1312 init_handler( HANDLER_CONTEXT
, &fs
, &gs
);
1313 if (!dispatch_signal(SIGINT
))
1315 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_exception
);
1316 rec
->ExceptionCode
= CONTROL_C_EXIT
;
1320 /**********************************************************************
1323 * Handler for SIGABRT.
1325 static HANDLER_DEF(abrt_handler
)
1327 EXCEPTION_RECORD
*rec
= setup_exception( HANDLER_CONTEXT
, raise_exception
);
1328 rec
->ExceptionCode
= EXCEPTION_WINE_ASSERTION
;
1329 rec
->ExceptionFlags
= EH_NONCONTINUABLE
;
1333 /**********************************************************************
1336 * Handler for SIGTERM.
1338 static HANDLER_DEF(term_handler
)
1341 init_handler( HANDLER_CONTEXT
, &fs
, &gs
);
1342 server_abort_thread(0);
1346 /**********************************************************************
1349 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1351 static HANDLER_DEF(usr1_handler
)
1356 init_handler( HANDLER_CONTEXT
, &fs
, &gs
);
1357 save_context( &context
, HANDLER_CONTEXT
, fs
, gs
);
1358 wait_suspend( &context
);
1359 restore_context( &context
, HANDLER_CONTEXT
);
1363 /**********************************************************************
1364 * get_signal_stack_total_size
1366 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1367 * Must be a power of two.
1369 size_t get_signal_stack_total_size(void)
1371 static const size_t teb_size
= 4096; /* we reserve one page for the TEB */
1373 if (!signal_stack_size
)
1375 size_t size
= 4096, min_size
= teb_size
+ max( MINSIGSTKSZ
, 4096 );
1376 /* find the first power of two not smaller than min_size */
1377 while (size
< min_size
) size
*= 2;
1378 signal_stack_mask
= size
- 1;
1379 signal_stack_size
= size
- teb_size
;
1381 return signal_stack_size
+ teb_size
;
1385 /***********************************************************************
1388 * Set a signal handler
1390 static int set_handler( int sig
, int have_sigaltstack
, void (*func
)() )
1392 struct sigaction sig_act
;
1395 if (!have_sigaltstack
)
1397 struct kernel_sigaction sig_act
;
1398 sig_act
.ksa_handler
= func
;
1399 sig_act
.ksa_flags
= SA_RESTART
;
1400 sig_act
.ksa_mask
= (1 << (SIGINT
-1)) |
1401 (1 << (SIGUSR1
-1)) |
1403 /* point to the top of the signal stack */
1404 sig_act
.ksa_restorer
= (char *)get_signal_stack() + signal_stack_size
;
1405 return wine_sigaction( sig
, &sig_act
, NULL
);
1408 sig_act
.sa_handler
= func
;
1409 sigemptyset( &sig_act
.sa_mask
);
1410 sigaddset( &sig_act
.sa_mask
, SIGINT
);
1411 sigaddset( &sig_act
.sa_mask
, SIGUSR1
);
1412 sigaddset( &sig_act
.sa_mask
, SIGUSR2
);
1414 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
1415 sig_act
.sa_flags
= SA_RESTART
;
1416 #elif defined (__svr4__) || defined(_SCO_DS) || defined(__APPLE__)
1417 sig_act
.sa_flags
= SA_SIGINFO
| SA_RESTART
;
1419 sig_act
.sa_flags
= 0;
1423 if (have_sigaltstack
) sig_act
.sa_flags
|= SA_ONSTACK
;
1425 return sigaction( sig
, &sig_act
, NULL
);
1429 /***********************************************************************
1430 * __wine_set_signal_handler (NTDLL.@)
1432 int __wine_set_signal_handler(unsigned int sig
, wine_signal_handler wsh
)
1434 if (sig
> sizeof(handlers
) / sizeof(handlers
[0])) return -1;
1435 if (handlers
[sig
] != NULL
) return -2;
1436 handlers
[sig
] = wsh
;
1441 /**********************************************************************
1444 BOOL
SIGNAL_Init(void)
1446 int have_sigaltstack
= 0;
1448 #ifdef HAVE_SIGALTSTACK
1449 struct sigaltstack ss
;
1450 ss
.ss_sp
= get_signal_stack();
1451 ss
.ss_size
= signal_stack_size
;
1453 if (!sigaltstack(&ss
, NULL
)) have_sigaltstack
= 1;
1455 /* sigaltstack may fail because the kernel is too old, or
1456 because glibc is brain-dead. In the latter case a
1457 direct system call should succeed. */
1458 else if (!wine_sigaltstack(&ss
, NULL
)) have_sigaltstack
= 1;
1460 #endif /* HAVE_SIGALTSTACK */
1462 if (set_handler( SIGINT
, have_sigaltstack
, (void (*)())int_handler
) == -1) goto error
;
1463 if (set_handler( SIGFPE
, have_sigaltstack
, (void (*)())fpe_handler
) == -1) goto error
;
1464 if (set_handler( SIGSEGV
, have_sigaltstack
, (void (*)())segv_handler
) == -1) goto error
;
1465 if (set_handler( SIGILL
, have_sigaltstack
, (void (*)())segv_handler
) == -1) goto error
;
1466 if (set_handler( SIGABRT
, have_sigaltstack
, (void (*)())abrt_handler
) == -1) goto error
;
1467 if (set_handler( SIGTERM
, have_sigaltstack
, (void (*)())term_handler
) == -1) goto error
;
1468 if (set_handler( SIGUSR1
, have_sigaltstack
, (void (*)())usr1_handler
) == -1) goto error
;
1470 if (set_handler( SIGBUS
, have_sigaltstack
, (void (*)())segv_handler
) == -1) goto error
;
1473 if (set_handler( SIGTRAP
, have_sigaltstack
, (void (*)())trap_handler
) == -1) goto error
;
1477 if (set_handler( SIGUSR2
, have_sigaltstack
, (void (*)())usr2_handler
) == -1) goto error
;
1483 perror("sigaction");
1489 /**********************************************************************
1490 * __wine_enter_vm86 (NTDLL.@)
1492 * Enter vm86 mode with the specified register context.
1494 void __wine_enter_vm86( CONTEXT
*context
)
1496 EXCEPTION_RECORD rec
;
1498 struct vm86plus_struct vm86
;
1500 memset( &vm86
, 0, sizeof(vm86
) );
1503 restore_vm86_context( context
, &vm86
);
1505 ntdll_get_thread_data()->vm86_ptr
= &vm86
;
1506 merge_vm86_pending_flags( &rec
);
1508 res
= vm86_enter( &ntdll_get_thread_data()->vm86_ptr
); /* uses and clears teb->vm86_ptr */
1515 save_vm86_context( context
, &vm86
);
1517 rec
.ExceptionFlags
= EXCEPTION_CONTINUABLE
;
1518 rec
.ExceptionRecord
= NULL
;
1519 rec
.ExceptionAddress
= (LPVOID
)context
->Eip
;
1520 rec
.NumberParameters
= 0;
1522 switch(VM86_TYPE(res
))
1524 case VM86_UNKNOWN
: /* unhandled GP fault - IO-instruction or similar */
1525 rec
.ExceptionCode
= EXCEPTION_PRIV_INSTRUCTION
;
1526 raise_segv_exception( &rec
, context
);
1528 case VM86_TRAP
: /* return due to DOS-debugger request */
1529 switch(VM86_ARG(res
))
1531 case TRAP_x86_TRCTRAP
: /* Single-step exception, single step flag is cleared by raise_trap_exception */
1532 rec
.ExceptionCode
= EXCEPTION_SINGLE_STEP
;
1534 case TRAP_x86_BPTFLT
: /* Breakpoint exception */
1535 rec
.ExceptionAddress
= (char *)rec
.ExceptionAddress
- 1; /* back up over the int3 instruction */
1538 rec
.ExceptionCode
= EXCEPTION_BREAKPOINT
;
1541 raise_trap_exception( &rec
, context
);
1543 case VM86_INTx
: /* int3/int x instruction (ARG = x) */
1544 rec
.ExceptionCode
= EXCEPTION_VM86_INTx
;
1545 rec
.NumberParameters
= 1;
1546 rec
.ExceptionInformation
[0] = VM86_ARG(res
);
1548 case VM86_STI
: /* sti/popf/iret instruction enabled virtual interrupts */
1549 context
->EFlags
|= VIF_MASK
;
1550 context
->EFlags
&= ~VIP_MASK
;
1551 NtCurrentTeb()->vm86_pending
= 0;
1552 rec
.ExceptionCode
= EXCEPTION_VM86_STI
;
1554 case VM86_PICRETURN
: /* return due to pending PIC request */
1555 rec
.ExceptionCode
= EXCEPTION_VM86_PICRETURN
;
1557 case VM86_SIGNAL
: /* cannot happen because vm86_enter handles this case */
1559 ERR( "unhandled result from vm86 mode %x\n", res
);
1562 __regs_RtlRaiseException( &rec
, context
);
1566 #else /* __HAVE_VM86 */
1567 /**********************************************************************
1568 * __wine_enter_vm86 (NTDLL.@)
1570 void __wine_enter_vm86( CONTEXT
*context
)
1572 MESSAGE("vm86 mode not supported on this platform\n");
1574 #endif /* __HAVE_VM86 */
1576 /**********************************************************************
1577 * DbgBreakPoint (NTDLL.@)
1579 __ASM_GLOBAL_FUNC( DbgBreakPoint
, "int $3; ret");
1581 /**********************************************************************
1582 * DbgUserBreakPoint (NTDLL.@)
1584 __ASM_GLOBAL_FUNC( DbgUserBreakPoint
, "int $3; ret");
1587 /**********************************************************************
1588 * EXC_CallHandler (internal)
1590 * Some exception handlers depend on EBP to have a fixed position relative to
1591 * the exception frame.
1592 * Shrinker depends on (*1) doing what it does,
1593 * (*2) being the exact instruction it is and (*3) beginning with 0x64
1594 * (i.e. the %fs prefix to the movl instruction). It also depends on the
1595 * function calling the handler having only 5 parameters (*4).
1597 __ASM_GLOBAL_FUNC( EXC_CallHandler
,
1599 " movl %esp, %ebp\n"
1601 " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1607 " call " __ASM_NAME("call_exception_handler") "\n"
1611 __ASM_GLOBAL_FUNC(call_exception_handler
,
1613 " movl %esp, %ebp\n"
1615 " pushl 12(%ebp)\n" /* make any exceptions in this... */
1616 " pushl %edx\n" /* handler be handled by... */
1618 " pushl (0)\n" /* nested_handler (passed in edx). */
1620 " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
1625 " movl 24(%ebp), %ecx\n" /* (*1) */
1626 " call *%ecx\n" /* call handler. (*2) */
1628 " movl (0), %esp\n" /* restore previous... (*3) */
1630 " popl (0)\n" /* exception frame. */
1631 " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
1633 " ret $20\n" /* (*4) */
1635 #endif /* __i386__ */