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 /***********************************************************************
60 * signal context platform-specific definitions
66 unsigned short sc_gs, __gsh;
67 unsigned short sc_fs, __fsh;
68 unsigned short sc_es, __esh;
69 unsigned short sc_ds, __dsh;
78 unsigned long sc_trapno;
81 unsigned short sc_cs, __csh;
82 unsigned long sc_eflags;
83 unsigned long esp_at_signal;
84 unsigned short sc_ss, __ssh;
86 unsigned long oldmask;
90 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
91 #define HANDLER_CONTEXT (&__context)
93 /* this is the sigaction structure from the Linux 2.1.20 kernel. */
94 struct kernel_sigaction
96 void (*ksa_handler)();
97 unsigned long ksa_mask;
98 unsigned long ksa_flags;
102 /* Similar to the sigaction function in libc, except it leaves alone the
103 restorer field, which is used to specify the signal stack address */
104 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
105 struct kernel_sigaction *old )
107 __asm__ __volatile__( "pushl %%ebx\n\t"
112 : "0" (SYS_sigaction), "S" (sig), "c" (new), "d" (old) );
113 if (sig>=0) return 0;
118 #ifdef HAVE_SIGALTSTACK
119 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
120 static inline int wine_sigaltstack( const struct sigaltstack *new,
121 struct sigaltstack *old )
124 __asm__ __volatile__( "pushl %%ebx\n\t"
129 : "0" (SYS_sigaltstack), "q" (new), "c" (old) );
130 if (ret >= 0) return 0;
136 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
138 int vm86_enter( void **vm86_ptr );
139 void vm86_return(void);
140 void vm86_return_end(void);
141 __ASM_GLOBAL_FUNC(vm86_enter,
143 "movl %esp, %ebp\n\t"
144 "movl $166,%eax\n\t" /*SYS_vm86*/
145 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
146 "movl (%ecx),%ecx\n\t"
148 "movl $1,%ebx\n\t" /*VM86_ENTER*/
149 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
153 ".globl " __ASM_NAME("vm86_return") "\n\t"
154 __ASM_FUNC("vm86_return") "\n"
155 __ASM_NAME("vm86_return") ":\n\t"
161 "testl %eax,%eax\n\t"
163 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
164 "je " __ASM_NAME("vm86_enter") "\n\t"
166 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
168 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
169 __ASM_FUNC("vm86_return_end") "\n"
170 __ASM_NAME("vm86_return_end") ":\n\t"
173 #ifdef HAVE_SYS_VM86_H
181 #define EAX_sig(context) ((context)->tf_eax)
182 #define EBX_sig(context) ((context)->tf_ebx)
183 #define ECX_sig(context) ((context)->tf_ecx)
184 #define EDX_sig(context) ((context)->tf_edx)
185 #define ESI_sig(context) ((context)->tf_esi)
186 #define EDI_sig(context) ((context)->tf_edi)
187 #define EBP_sig(context) ((context)->tf_ebp)
189 #define CS_sig(context) ((context)->tf_cs)
190 #define DS_sig(context) ((context)->tf_ds)
191 #define ES_sig(context) ((context)->tf_es)
192 #define SS_sig(context) ((context)->tf_ss)
194 #include <machine/frame.h>
195 typedef struct trapframe SIGCONTEXT;
197 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
198 #define HANDLER_CONTEXT __context
200 #define EFL_sig(context) ((context)->tf_eflags)
202 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
203 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
207 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
209 typedef struct sigcontext SIGCONTEXT;
211 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
212 #define HANDLER_CONTEXT __context
216 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
219 #include <sys/regset.h>
223 #include <sys/ucontext.h>
225 typedef struct ucontext SIGCONTEXT;
227 #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
228 #define HANDLER_CONTEXT __context
230 #endif /* svr4 || SCO_DS */
236 unsigned long ContextFlags;
237 FLOATING_SAVE_AREA sc_float;
242 unsigned long sc_edi;
243 unsigned long sc_esi;
244 unsigned long sc_eax;
245 unsigned long sc_ebx;
246 unsigned long sc_ecx;
247 unsigned long sc_edx;
248 unsigned long sc_ebp;
249 unsigned long sc_eip;
251 unsigned long sc_eflags;
252 unsigned long sc_esp;
260 /* FIXME: This section is just here so it can compile, it's most likely
261 * completely wrong. */
265 unsigned short sc_gs, __gsh;
266 unsigned short sc_fs, __fsh;
267 unsigned short sc_es, __esh;
268 unsigned short sc_ds, __dsh;
269 unsigned long sc_edi;
270 unsigned long sc_esi;
271 unsigned long sc_ebp;
272 unsigned long sc_esp;
273 unsigned long sc_ebx;
274 unsigned long sc_edx;
275 unsigned long sc_ecx;
276 unsigned long sc_eax;
277 unsigned long sc_trapno;
278 unsigned long sc_err;
279 unsigned long sc_eip;
280 unsigned short sc_cs, __csh;
281 unsigned long sc_eflags;
282 unsigned long esp_at_signal;
283 unsigned short sc_ss, __ssh;
285 unsigned long oldmask;
289 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
290 #define HANDLER_CONTEXT (&__context)
292 #endif /* __CYGWIN__ */
295 # include <sys/ucontext.h>
296 # include <sys/types.h>
299 typedef siginfo_t siginfo;
300 typedef struct ucontext SIGCONTEXT;
302 # define HANDLER_DEF(name) void name( int __signal, siginfo *__siginfo, SIGCONTEXT *__context )
303 # define HANDLER_CONTEXT (__context)
305 #endif /* __APPLE__ */
307 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
308 defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
310 #define EAX_sig(context) ((context)->sc_eax)
311 #define EBX_sig(context) ((context)->sc_ebx)
312 #define ECX_sig(context) ((context)->sc_ecx)
313 #define EDX_sig(context) ((context)->sc_edx)
314 #define ESI_sig(context) ((context)->sc_esi)
315 #define EDI_sig(context) ((context)->sc_edi)
316 #define EBP_sig(context) ((context)->sc_ebp)
318 #define CS_sig(context) ((context)->sc_cs)
319 #define DS_sig(context) ((context)->sc_ds)
320 #define ES_sig(context) ((context)->sc_es)
321 #define FS_sig(context) ((context)->sc_fs)
322 #define GS_sig(context) ((context)->sc_gs)
323 #define SS_sig(context) ((context)->sc_ss)
325 #define TRAP_sig(context) ((context)->sc_trapno)
328 #define ERROR_sig(context) ((context)->sc_err)
332 #define ERROR_sig(context) ((context)->sc_err)
333 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
334 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
338 #define EFL_sig(context) ((context)->sc_efl)
339 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
340 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
342 #define EFL_sig(context) ((context)->sc_eflags)
345 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
346 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
348 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
350 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
356 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
357 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
358 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
359 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
360 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
361 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
362 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
364 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
365 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
366 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
367 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
369 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
370 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
372 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
374 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
376 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
378 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
380 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
383 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
386 #define FAULT_ADDRESS (__siginfo->si_addr)
388 #endif /* svr4 || SCO_DS */
391 #define EAX_sig(context) ((context)->uc_mcontext.sc_eax)
392 #define EBX_sig(context) ((context)->uc_mcontext.sc_ebx)
393 #define ECX_sig(context) ((context)->uc_mcontext.sc_ecx)
394 #define EDX_sig(context) ((context)->uc_mcontext.sc_edx)
395 #define ESI_sig(context) ((context)->uc_mcontext.sc_esi)
396 #define EDI_sig(context) ((context)->uc_mcontext.sc_edi)
397 #define EBP_sig(context) ((context)->uc_mcontext.sc_ebp)
399 #define CS_sig(context) ((context)->uc_mcontext.sc_cs)
400 #define DS_sig(context) ((context)->uc_mcontext.sc_ds)
401 #define ES_sig(context) ((context)->uc_mcontext.sc_es)
402 #define FS_sig(context) ((context)->uc_mcontext.sc_fs)
403 #define GS_sig(context) ((context)->uc_mcontext.sc_gs)
404 #define SS_sig(context) ((context)->uc_mcontext.sc_ss)
406 #define EFL_sig(context) ((context)->uc_mcontext.sc_eflags)
408 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.sc_eip))
409 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.sc_esp))
411 #endif /* __APPLE__ */
413 /* exception code definitions (already defined by FreeBSD/NetBSD) */
414 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
415 #define T_DIVIDE 0 /* Division by zero exception */
416 #define T_TRCTRAP 1 /* Single-step exception */
417 #define T_NMI 2 /* NMI interrupt */
418 #define T_BPTFLT 3 /* Breakpoint exception */
419 #define T_OFLOW 4 /* Overflow exception */
420 #define T_BOUND 5 /* Bound range exception */
421 #define T_PRIVINFLT 6 /* Invalid opcode exception */
422 #define T_DNA 7 /* Device not available exception */
423 #define T_DOUBLEFLT 8 /* Double fault exception */
424 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
425 #define T_TSSFLT 10 /* Invalid TSS exception */
426 #define T_SEGNPFLT 11 /* Segment not present exception */
427 #define T_STKFLT 12 /* Stack fault */
428 #define T_PROTFLT 13 /* General protection fault */
429 #define T_PAGEFLT 14 /* Page fault */
430 #define T_RESERVED 15 /* Unknown exception */
431 #define T_ARITHTRAP 16 /* Floating point exception */
432 #define T_ALIGNFLT 17 /* Alignment check exception */
433 #define T_MCHK 18 /* Machine check exception */
434 #define T_CACHEFLT 19 /* Cache flush exception */
436 #if defined(__NetBSD__)
437 #define T_MCHK 19 /* Machine check exception */
440 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
442 #include "wine/exception.h"
443 #include "wine/debug.h"
445 WINE_DEFAULT_DEBUG_CHANNEL(seh);
447 typedef int (*wine_signal_handler)(unsigned int sig);
449 static wine_signal_handler handlers[256];
451 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context );
454 /***********************************************************************
457 inline static int dispatch_signal(unsigned int sig)
459 if (handlers[sig] == NULL) return 0;
460 return handlers[sig](sig);
464 /***********************************************************************
467 * Get the trap code for a signal.
469 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
472 return TRAP_sig(sigcontext);
474 return T_UNKNOWN; /* unknown trap code */
478 /***********************************************************************
481 * Get the error code for a signal.
483 static inline int get_error_code( const SIGCONTEXT *sigcontext )
486 return ERROR_sig(sigcontext);
492 /***********************************************************************
495 * Get the base of the signal stack for the current thread.
497 static inline void *get_signal_stack(void)
499 return (char *)NtCurrentTeb() + 4096;
503 /***********************************************************************
506 * Get the current teb based on the stack pointer.
508 static inline TEB *get_current_teb(void)
511 __asm__("movl %%esp,%0" : "=g" (esp) );
512 return (TEB *)((esp & ~4095) - 4096);
517 /***********************************************************************
520 * Set the register values from a vm86 structure.
522 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
524 context->Eax = vm86->regs.eax;
525 context->Ebx = vm86->regs.ebx;
526 context->Ecx = vm86->regs.ecx;
527 context->Edx = vm86->regs.edx;
528 context->Esi = vm86->regs.esi;
529 context->Edi = vm86->regs.edi;
530 context->Esp = vm86->regs.esp;
531 context->Ebp = vm86->regs.ebp;
532 context->Eip = vm86->regs.eip;
533 context->SegCs = vm86->regs.cs;
534 context->SegDs = vm86->regs.ds;
535 context->SegEs = vm86->regs.es;
536 context->SegFs = vm86->regs.fs;
537 context->SegGs = vm86->regs.gs;
538 context->SegSs = vm86->regs.ss;
539 context->EFlags = vm86->regs.eflags;
543 /***********************************************************************
544 * restore_vm86_context
546 * Build a vm86 structure from the register values.
548 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
550 vm86->regs.eax = context->Eax;
551 vm86->regs.ebx = context->Ebx;
552 vm86->regs.ecx = context->Ecx;
553 vm86->regs.edx = context->Edx;
554 vm86->regs.esi = context->Esi;
555 vm86->regs.edi = context->Edi;
556 vm86->regs.esp = context->Esp;
557 vm86->regs.ebp = context->Ebp;
558 vm86->regs.eip = context->Eip;
559 vm86->regs.cs = context->SegCs;
560 vm86->regs.ds = context->SegDs;
561 vm86->regs.es = context->SegEs;
562 vm86->regs.fs = context->SegFs;
563 vm86->regs.gs = context->SegGs;
564 vm86->regs.ss = context->SegSs;
565 vm86->regs.eflags = context->EFlags;
569 /**********************************************************************
570 * merge_vm86_pending_flags
572 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
573 * raises exception if there are pending events and VIF flag
574 * has been turned on.
576 * Called from __wine_enter_vm86 because vm86_enter
577 * doesn't check for pending events.
579 * Called from raise_vm86_sti_exception to check for
580 * pending events in a signal safe way.
582 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
584 BOOL check_pending = TRUE;
585 struct vm86plus_struct *vm86 =
586 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
589 * In order to prevent a race when SIGUSR2 occurs while
590 * we are returning from exception handler, pending events
591 * will be rechecked after each raised exception.
593 while (check_pending && NtCurrentTeb()->vm86_pending)
595 check_pending = FALSE;
596 ntdll_get_thread_data()->vm86_ptr = NULL;
599 * If VIF is set, throw exception.
600 * Note that SIGUSR2 may turn VIF flag off so
601 * VIF check must occur only when TEB.vm86_ptr is NULL.
603 if (vm86->regs.eflags & VIF_MASK)
606 save_vm86_context( &vcontext, vm86 );
608 rec->ExceptionCode = EXCEPTION_VM86_STI;
609 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
610 rec->ExceptionRecord = NULL;
611 rec->NumberParameters = 0;
612 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
614 vcontext.EFlags &= ~VIP_MASK;
615 NtCurrentTeb()->vm86_pending = 0;
616 __regs_RtlRaiseException( rec, &vcontext );
618 restore_vm86_context( &vcontext, vm86 );
619 check_pending = TRUE;
622 ntdll_get_thread_data()->vm86_ptr = vm86;
626 * Merge VIP flags in a signal safe way. This requires
627 * that the following operation compiles into atomic
630 vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
632 #endif /* __HAVE_VM86 */
635 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
638 /***********************************************************************
641 * Handler initialization when the full context is not needed.
643 static void *init_handler( const SIGCONTEXT *sigcontext )
645 void *stack = (void *)ESP_sig(sigcontext);
646 TEB *teb = get_current_teb();
647 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
649 wine_set_fs( thread_data->teb_sel );
651 /* now restore a proper %gs for the fault handler */
652 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
653 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
656 * Win16 or DOS protected mode. Note that during switch
657 * from 16-bit mode to linear mode, CS may be set to system
658 * segment before FS is restored. Fortunately, in this case
659 * SS is still non-system segment. This is why both CS and SS
662 wine_set_gs( teb->gs_sel );
663 stack = teb->WOW32Reserved;
666 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
668 unsigned int *int_stack = stack;
669 /* fetch the saved %gs from the stack */
670 wine_set_gs( int_stack[0] );
673 else /* 32-bit mode */
676 wine_set_gs( GS_sig(sigcontext) );
683 /***********************************************************************
686 * Set the FPU context from a sigcontext.
688 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
691 if (FPU_sig(sigcontext))
693 context->FloatSave = *FPU_sig(sigcontext);
698 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
699 #endif /* __GNUC__ */
703 /***********************************************************************
706 * Restore the FPU context to a sigcontext.
708 inline static void restore_fpu( CONTEXT *context )
710 /* reset the current interrupt status */
711 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
713 /* avoid nested exceptions */
714 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
715 #endif /* __GNUC__ */
719 /***********************************************************************
722 * Setup a proper stack frame for the raise function, and modify the
723 * sigcontext so that the return from the signal handler will call
724 * the raise function.
726 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
730 void *ret_addr; /* return address from raise_func */
731 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
732 CONTEXT *context_ptr; /* second arg for raise_func */
733 void *dummy; /* dummy ret addr for __wine_call_from_32_restore_regs */
735 EXCEPTION_RECORD rec;
742 /* get %fs and %gs at time of the fault */
744 fs = LOWORD(FS_sig(sigcontext));
749 gs = LOWORD(GS_sig(sigcontext));
754 stack = init_handler( sigcontext );
756 /* stack sanity checks */
758 if ((char *)stack >= (char *)get_signal_stack() &&
759 (char *)stack < (char *)get_signal_stack() + SIGNAL_STACK_SIZE)
761 ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
762 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
763 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
764 server_abort_thread(1);
767 if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
768 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
770 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack;
773 ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
774 diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
775 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
776 server_abort_thread(1);
778 else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
779 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
780 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
783 stack--; /* push the stack_layout structure */
784 stack->ret_addr = __wine_call_from_32_restore_regs;
785 stack->rec_ptr = &stack->rec;
786 stack->context_ptr = &stack->context;
788 stack->rec.ExceptionRecord = NULL;
789 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
790 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
791 stack->rec.NumberParameters = 0;
793 stack->context.ContextFlags = CONTEXT_FULL;
794 stack->context.Eax = EAX_sig(sigcontext);
795 stack->context.Ebx = EBX_sig(sigcontext);
796 stack->context.Ecx = ECX_sig(sigcontext);
797 stack->context.Edx = EDX_sig(sigcontext);
798 stack->context.Esi = ESI_sig(sigcontext);
799 stack->context.Edi = EDI_sig(sigcontext);
800 stack->context.Ebp = EBP_sig(sigcontext);
801 stack->context.EFlags = EFL_sig(sigcontext);
802 stack->context.Eip = EIP_sig(sigcontext);
803 stack->context.Esp = ESP_sig(sigcontext);
804 stack->context.SegCs = LOWORD(CS_sig(sigcontext));
805 stack->context.SegDs = LOWORD(DS_sig(sigcontext));
806 stack->context.SegEs = LOWORD(ES_sig(sigcontext));
807 stack->context.SegFs = fs;
808 stack->context.SegGs = gs;
809 stack->context.SegSs = LOWORD(SS_sig(sigcontext));
811 /* now modify the sigcontext to return to the raise function */
812 ESP_sig(sigcontext) = (DWORD)stack;
813 EIP_sig(sigcontext) = (DWORD)func;
814 CS_sig(sigcontext) = wine_get_cs();
815 DS_sig(sigcontext) = wine_get_ds();
816 ES_sig(sigcontext) = wine_get_es();
817 FS_sig(sigcontext) = wine_get_fs();
818 GS_sig(sigcontext) = wine_get_gs();
819 SS_sig(sigcontext) = wine_get_ss();
821 return stack->rec_ptr;
825 /***********************************************************************
826 * get_exception_context
828 * Get a pointer to the context built by setup_exception.
830 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
832 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
836 /**********************************************************************
839 * Get the FPU exception code from the FPU status.
841 static inline DWORD get_fpu_code( const CONTEXT *context )
843 DWORD status = context->FloatSave.StatusWord;
845 if (status & 0x01) /* IE */
847 if (status & 0x40) /* SF */
848 return EXCEPTION_FLT_STACK_CHECK;
850 return EXCEPTION_FLT_INVALID_OPERATION;
852 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
853 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
854 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
855 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
856 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
857 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
861 /**********************************************************************
862 * raise_segv_exception
864 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
866 switch(rec->ExceptionCode)
868 case EXCEPTION_ACCESS_VIOLATION:
869 if (rec->NumberParameters == 2)
871 if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] )))
875 case EXCEPTION_DATATYPE_MISALIGNMENT:
876 /* FIXME: pass through exception handler first? */
877 if (context->EFlags & 0x00040000)
879 /* Disable AC flag, return */
880 context->EFlags &= ~0x00040000;
885 __regs_RtlRaiseException( rec, context );
889 /**********************************************************************
890 * raise_trap_exception
892 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
894 DWORD dr0, dr1, dr2, dr3, dr6, dr7;
896 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
898 if (context->EFlags & 0x100)
900 context->EFlags &= ~0x100; /* clear single-step flag */
902 else /* hardware breakpoint, fetch the debug registers */
904 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
905 NtGetContextThread(GetCurrentThread(), context);
906 /* do we really have a bp from a debug register ?
907 * if not, then someone did a kill(SIGTRAP) on us, and we
908 * shall return a breakpoint, not a single step exception
910 if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
921 __regs_RtlRaiseException( rec, context );
923 if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
924 dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
926 /* the debug registers have changed, set the new values */
927 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
928 NtSetContextThread(GetCurrentThread(), context);
933 /**********************************************************************
934 * raise_fpu_exception
936 static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
938 __regs_RtlRaiseException( rec, context );
939 restore_fpu( context );
944 /**********************************************************************
945 * raise_vm86_sti_exception
947 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
949 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
950 NtCurrentTeb()->vm86_pending |= VIP_MASK;
952 if (ntdll_get_thread_data()->vm86_ptr)
954 if (((char*)context->Eip >= (char*)vm86_return) &&
955 ((char*)context->Eip <= (char*)vm86_return_end) &&
956 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
957 /* exiting from VM86, can't throw */
960 merge_vm86_pending_flags( rec );
962 else if (NtCurrentTeb()->dpmi_vif &&
963 !wine_ldt_is_system(context->SegCs) &&
964 !wine_ldt_is_system(context->SegSs))
966 /* Executing DPMI code and virtual interrupts are enabled. */
967 NtCurrentTeb()->vm86_pending = 0;
968 __regs_RtlRaiseException( rec, context );
973 /**********************************************************************
976 * Handler for SIGUSR2.
977 * We use it to signal that the running __wine_enter_vm86() should
978 * immediately set VIP_MASK, causing pending events to be handled
979 * as early as possible.
981 static HANDLER_DEF(usr2_handler)
983 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
984 rec->ExceptionCode = EXCEPTION_VM86_STI;
986 #endif /* __HAVE_VM86 */
989 /**********************************************************************
992 * Handler for SIGSEGV and related errors.
994 static HANDLER_DEF(segv_handler)
996 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
998 switch(get_trap_code(HANDLER_CONTEXT))
1000 case T_OFLOW: /* Overflow exception */
1001 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1003 case T_BOUND: /* Bound range exception */
1004 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1006 case T_PRIVINFLT: /* Invalid opcode exception */
1007 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1009 case T_STKFLT: /* Stack fault */
1010 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1012 case T_SEGNPFLT: /* Segment not present exception */
1013 case T_PROTFLT: /* General protection fault */
1014 case T_UNKNOWN: /* Unknown fault code */
1015 rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
1016 : EXCEPTION_PRIV_INSTRUCTION;
1018 case T_PAGEFLT: /* Page fault */
1019 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1020 #ifdef FAULT_ADDRESS
1021 rec->NumberParameters = 2;
1022 rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
1023 rec->ExceptionInformation[1] = (ULONG_PTR)FAULT_ADDRESS;
1026 case T_ALIGNFLT: /* Alignment check exception */
1027 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1030 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1032 case T_NMI: /* NMI interrupt */
1033 case T_DNA: /* Device not available exception */
1034 case T_DOUBLEFLT: /* Double fault exception */
1035 case T_TSSFLT: /* Invalid TSS exception */
1036 case T_RESERVED: /* Unknown exception */
1037 case T_MCHK: /* Machine check exception */
1039 case T_CACHEFLT: /* Cache flush exception */
1041 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1047 /**********************************************************************
1050 * Handler for SIGTRAP.
1052 static HANDLER_DEF(trap_handler)
1054 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
1056 switch(get_trap_code(HANDLER_CONTEXT))
1058 case T_TRCTRAP: /* Single-step exception */
1059 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1060 EFL_sig(HANDLER_CONTEXT) &= ~0x100; /* clear single-step flag */
1062 case T_BPTFLT: /* Breakpoint exception */
1063 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1066 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1072 /**********************************************************************
1075 * Handler for SIGFPE.
1077 static HANDLER_DEF(fpe_handler)
1079 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception );
1082 context = get_exception_context( rec );
1083 save_fpu( context, HANDLER_CONTEXT );
1085 switch(get_trap_code(HANDLER_CONTEXT))
1087 case T_DIVIDE: /* Division by zero exception */
1088 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1090 case T_FPOPFLT: /* Coprocessor segment overrun */
1091 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1093 case T_ARITHTRAP: /* Floating point exception */
1094 case T_UNKNOWN: /* Unknown fault code */
1095 rec->ExceptionCode = get_fpu_code( context );
1098 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1099 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1105 /**********************************************************************
1108 * Handler for SIGINT.
1110 static HANDLER_DEF(int_handler)
1112 init_handler( HANDLER_CONTEXT );
1113 if (!dispatch_signal(SIGINT))
1115 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, __regs_RtlRaiseException );
1116 rec->ExceptionCode = CONTROL_C_EXIT;
1120 /**********************************************************************
1123 * Handler for SIGABRT.
1125 static HANDLER_DEF(abrt_handler)
1127 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, __regs_RtlRaiseException );
1128 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1129 rec->ExceptionFlags = EH_NONCONTINUABLE;
1133 /**********************************************************************
1136 * Handler for SIGTERM.
1138 static HANDLER_DEF(term_handler)
1140 init_handler( HANDLER_CONTEXT );
1141 server_abort_thread(0);
1145 /**********************************************************************
1148 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1150 static HANDLER_DEF(usr1_handler)
1152 LARGE_INTEGER timeout;
1154 init_handler( HANDLER_CONTEXT );
1155 /* wait with 0 timeout, will only return once the thread is no longer suspended */
1156 timeout.QuadPart = 0;
1157 NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout, 0 );
1161 /***********************************************************************
1164 * Set a signal handler
1166 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1168 struct sigaction sig_act;
1171 if (!have_sigaltstack)
1173 struct kernel_sigaction sig_act;
1174 sig_act.ksa_handler = func;
1175 sig_act.ksa_flags = SA_RESTART;
1176 sig_act.ksa_mask = (1 << (SIGINT-1)) |
1178 /* point to the top of the signal stack */
1179 sig_act.ksa_restorer = (char *)get_signal_stack() + SIGNAL_STACK_SIZE;
1180 return wine_sigaction( sig, &sig_act, NULL );
1183 sig_act.sa_handler = func;
1184 sigemptyset( &sig_act.sa_mask );
1185 sigaddset( &sig_act.sa_mask, SIGINT );
1186 sigaddset( &sig_act.sa_mask, SIGUSR2 );
1188 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
1189 sig_act.sa_flags = SA_RESTART;
1190 #elif defined (__svr4__) || defined(_SCO_DS)
1191 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1193 sig_act.sa_flags = 0;
1197 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1199 return sigaction( sig, &sig_act, NULL );
1203 /***********************************************************************
1204 * __wine_set_signal_handler (NTDLL.@)
1206 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1208 if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1209 if (handlers[sig] != NULL) return -2;
1210 handlers[sig] = wsh;
1215 /**********************************************************************
1218 BOOL SIGNAL_Init(void)
1220 int have_sigaltstack = 0;
1222 #ifdef HAVE_SIGALTSTACK
1223 struct sigaltstack ss;
1224 ss.ss_sp = get_signal_stack();
1225 ss.ss_size = SIGNAL_STACK_SIZE;
1227 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1229 /* sigaltstack may fail because the kernel is too old, or
1230 because glibc is brain-dead. In the latter case a
1231 direct system call should succeed. */
1232 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1234 #endif /* HAVE_SIGALTSTACK */
1236 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1237 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1238 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1239 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1240 if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1241 if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1242 if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1244 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1247 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1251 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1257 perror("sigaction");
1263 /**********************************************************************
1264 * __wine_enter_vm86 (NTDLL.@)
1266 * Enter vm86 mode with the specified register context.
1268 void __wine_enter_vm86( CONTEXT *context )
1270 EXCEPTION_RECORD rec;
1272 struct vm86plus_struct vm86;
1274 memset( &vm86, 0, sizeof(vm86) );
1277 restore_vm86_context( context, &vm86 );
1279 ntdll_get_thread_data()->vm86_ptr = &vm86;
1280 merge_vm86_pending_flags( &rec );
1282 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1289 save_vm86_context( context, &vm86 );
1291 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1292 rec.ExceptionRecord = NULL;
1293 rec.ExceptionAddress = (LPVOID)context->Eip;
1294 rec.NumberParameters = 0;
1296 switch(VM86_TYPE(res))
1298 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1299 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1300 raise_segv_exception( &rec, context );
1302 case VM86_TRAP: /* return due to DOS-debugger request */
1303 switch(VM86_ARG(res))
1305 case T_TRCTRAP: /* Single-step exception, single step flag is cleared by raise_trap_exception */
1306 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1308 case T_BPTFLT: /* Breakpoint exception */
1309 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1312 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1315 raise_trap_exception( &rec, context );
1317 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1318 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1319 rec.NumberParameters = 1;
1320 rec.ExceptionInformation[0] = VM86_ARG(res);
1322 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1323 context->EFlags |= VIF_MASK;
1324 context->EFlags &= ~VIP_MASK;
1325 NtCurrentTeb()->vm86_pending = 0;
1326 rec.ExceptionCode = EXCEPTION_VM86_STI;
1328 case VM86_PICRETURN: /* return due to pending PIC request */
1329 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1331 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1333 ERR( "unhandled result from vm86 mode %x\n", res );
1336 __regs_RtlRaiseException( &rec, context );
1340 #else /* __HAVE_VM86 */
1341 /**********************************************************************
1342 * __wine_enter_vm86 (NTDLL.@)
1344 void __wine_enter_vm86( CONTEXT *context )
1346 MESSAGE("vm86 mode not supported on this platform\n");
1348 #endif /* __HAVE_VM86 */
1350 /**********************************************************************
1351 * DbgBreakPoint (NTDLL.@)
1353 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1355 /**********************************************************************
1356 * DbgUserBreakPoint (NTDLL.@)
1358 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1360 #endif /* __i386__ */