2 * i386 signal handling routines
4 * Copyright 1999 Alexandre Julliard
17 #ifdef HAVE_SYS_PARAM_H
18 # include <sys/param.h>
23 # ifdef HAVE_SYS_SYSCALL_H
24 # include <sys/syscall.h>
28 #ifdef HAVE_SYS_VM86_H
29 # include <sys/vm86.h>
32 #ifdef HAVE_SYS_SIGNAL_H
33 # include <sys/signal.h>
37 #include "selectors.h"
39 /***********************************************************************
40 * signal context platform-specific definitions
46 unsigned short sc_gs, __gsh;
47 unsigned short sc_fs, __fsh;
48 unsigned short sc_es, __esh;
49 unsigned short sc_ds, __dsh;
58 unsigned long sc_trapno;
61 unsigned short sc_cs, __csh;
62 unsigned long sc_eflags;
63 unsigned long esp_at_signal;
64 unsigned short sc_ss, __ssh;
66 unsigned long oldmask;
70 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
71 #define HANDLER_CONTEXT (&__context)
73 /* this is the sigaction structure from the Linux 2.1.20 kernel. */
74 struct kernel_sigaction
76 void (*ksa_handler)();
77 unsigned long ksa_mask;
78 unsigned long ksa_flags;
82 /* Similar to the sigaction function in libc, except it leaves alone the
83 restorer field, which is used to specify the signal stack address */
84 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
85 struct kernel_sigaction *old )
87 __asm__ __volatile__( "pushl %%ebx\n\t"
92 : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
98 #ifdef HAVE_SIGALTSTACK
99 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
100 static inline int wine_sigaltstack( const struct sigaltstack *new,
101 struct sigaltstack *old )
104 __asm__ __volatile__( "pushl %%ebx\n\t"
109 : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
110 if (ret >= 0) return 0;
116 int vm86_enter( struct vm86plus_struct *ptr );
118 __ASM_GLOBAL_FUNC(vm86_enter,
120 "movl %esp, %ebp\n\t"
121 "movl $166,%eax\n\t" /*SYS_vm86*/
122 "movl 8(%ebp),%ecx\n\t"
124 "movl $1,%ebx\n\t" /*VM86_ENTER*/
125 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
128 ".globl " __ASM_NAME("vm86_return") "\n\t"
129 ".type " __ASM_NAME("vm86_return") ",@function\n"
130 __ASM_NAME("vm86_return") ":\n\t"
143 #define EAX_sig(context) ((context)->tf_eax)
144 #define EBX_sig(context) ((context)->tf_ebx)
145 #define ECX_sig(context) ((context)->tf_ecx)
146 #define EDX_sig(context) ((context)->tf_edx)
147 #define ESI_sig(context) ((context)->tf_esi)
148 #define EDI_sig(context) ((context)->tf_edi)
149 #define EBP_sig(context) ((context)->tf_ebp)
151 #define CS_sig(context) ((context)->tf_cs)
152 #define DS_sig(context) ((context)->tf_ds)
153 #define ES_sig(context) ((context)->tf_es)
154 #define SS_sig(context) ((context)->tf_ss)
156 #include <machine/frame.h>
157 typedef struct trapframe SIGCONTEXT;
159 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
160 #define HANDLER_CONTEXT __context
162 #define EFL_sig(context) ((context)->tf_eflags)
164 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
165 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
169 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
171 typedef struct sigcontext SIGCONTEXT;
173 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
174 #define HANDLER_CONTEXT __context
178 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
181 #include <sys/regset.h>
185 #include <sys/ucontext.h>
187 typedef struct ucontext SIGCONTEXT;
189 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
190 #define HANDLER_CONTEXT __context
192 #endif /* svr4 || SCO_DS */
198 unsigned long ContextFlags;
199 FLOATING_SAVE_AREA sc_float;
204 unsigned long sc_edi;
205 unsigned long sc_esi;
206 unsigned long sc_eax;
207 unsigned long sc_ebx;
208 unsigned long sc_ecx;
209 unsigned long sc_edx;
210 unsigned long sc_ebp;
211 unsigned long sc_eip;
213 unsigned long sc_eflags;
214 unsigned long sc_esp;
221 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__EMX__)
223 #define EAX_sig(context) ((context)->sc_eax)
224 #define EBX_sig(context) ((context)->sc_ebx)
225 #define ECX_sig(context) ((context)->sc_ecx)
226 #define EDX_sig(context) ((context)->sc_edx)
227 #define ESI_sig(context) ((context)->sc_esi)
228 #define EDI_sig(context) ((context)->sc_edi)
229 #define EBP_sig(context) ((context)->sc_ebp)
231 #define CS_sig(context) ((context)->sc_cs)
232 #define DS_sig(context) ((context)->sc_ds)
233 #define ES_sig(context) ((context)->sc_es)
234 #define SS_sig(context) ((context)->sc_ss)
236 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
237 * saved by the exception handling. duh.
238 * Actually they are in -current (have been for a while), and that
239 * patch now finally has been MFC'd to -stable too (Nov 15 1999).
240 * If you're running a system from the -stable branch older than that,
241 * like a 3.3-RELEASE, grab the patch from the ports tree:
242 * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
243 * (If its not yet there when you look, go here:
244 * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
247 #define FS_sig(context) ((context)->sc_fs)
248 #define GS_sig(context) ((context)->sc_gs)
252 #define FS_sig(context) ((context)->sc_fs)
253 #define GS_sig(context) ((context)->sc_gs)
254 #define CR2_sig(context) ((context)->cr2)
255 #define TRAP_sig(context) ((context)->sc_trapno)
256 #define ERROR_sig(context) ((context)->sc_err)
257 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
261 #define EFL_sig(context) ((context)->sc_eflags)
263 #define EFL_sig(context) ((context)->sc_efl)
264 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
265 #define CR2_sig(context) ((context)->sc_err)
266 #define TRAP_sig(context) ((context)->sc_trapno)
269 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
270 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
272 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
274 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
280 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
281 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
282 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
283 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
284 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
285 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
286 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
288 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
289 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
290 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
291 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
293 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
294 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
296 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
298 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
300 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
302 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
305 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
308 #endif /* svr4 || SCO_DS */
311 /* exception code definitions (already defined by FreeBSD/NetBSD) */
312 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
313 #define T_DIVIDE 0 /* Division by zero exception */
314 #define T_TRCTRAP 1 /* Single-step exception */
315 #define T_NMI 2 /* NMI interrupt */
316 #define T_BPTFLT 3 /* Breakpoint exception */
317 #define T_OFLOW 4 /* Overflow exception */
318 #define T_BOUND 5 /* Bound range exception */
319 #define T_PRIVINFLT 6 /* Invalid opcode exception */
320 #define T_DNA 7 /* Device not available exception */
321 #define T_DOUBLEFLT 8 /* Double fault exception */
322 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
323 #define T_TSSFLT 10 /* Invalid TSS exception */
324 #define T_SEGNPFLT 11 /* Segment not present exception */
325 #define T_STKFLT 12 /* Stack fault */
326 #define T_PROTFLT 13 /* General protection fault */
327 #define T_PAGEFLT 14 /* Page fault */
328 #define T_RESERVED 15 /* Unknown exception */
329 #define T_ARITHTRAP 16 /* Floating point exception */
330 #define T_ALIGNFLT 17 /* Alignment check exception */
331 #define T_MCHK 18 /* Machine check exception */
332 #define T_CACHEFLT 19 /* Cache flush exception */
334 #if defined(__NetBSD__)
335 #define T_MCHK 19 /* Machine check exception */
338 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
340 #include "wine/exception.h"
342 #include "stackframe.h"
346 #include "syslevel.h"
347 #include "debugtools.h"
349 DEFAULT_DEBUG_CHANNEL(seh);
351 static sigset_t all_sigs;
354 /***********************************************************************
357 * Get the trap code for a signal.
359 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
362 return TRAP_sig(sigcontext);
364 return T_UNKNOWN; /* unknown trap code */
368 /***********************************************************************
371 * Get the error code for a signal.
373 static inline int get_error_code( const SIGCONTEXT *sigcontext )
376 return ERROR_sig(sigcontext);
382 /***********************************************************************
385 * Get the CR2 value for a signal.
387 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
390 return (void *)CR2_sig(sigcontext);
398 /***********************************************************************
401 * Set the register values from a vm86 structure.
403 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
405 context->Eax = vm86->regs.eax;
406 context->Ebx = vm86->regs.ebx;
407 context->Ecx = vm86->regs.ecx;
408 context->Edx = vm86->regs.edx;
409 context->Esi = vm86->regs.esi;
410 context->Edi = vm86->regs.edi;
411 context->Esp = vm86->regs.esp;
412 context->Ebp = vm86->regs.ebp;
413 context->Eip = vm86->regs.eip;
414 context->SegCs = vm86->regs.cs;
415 context->SegDs = vm86->regs.ds;
416 context->SegEs = vm86->regs.es;
417 context->SegFs = vm86->regs.fs;
418 context->SegGs = vm86->regs.gs;
419 context->SegSs = vm86->regs.ss;
420 context->EFlags = vm86->regs.eflags;
424 /***********************************************************************
425 * restore_vm86_context
427 * Build a vm86 structure from the register values.
429 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
431 vm86->regs.eax = context->Eax;
432 vm86->regs.ebx = context->Ebx;
433 vm86->regs.ecx = context->Ecx;
434 vm86->regs.edx = context->Edx;
435 vm86->regs.esi = context->Esi;
436 vm86->regs.edi = context->Edi;
437 vm86->regs.esp = context->Esp;
438 vm86->regs.ebp = context->Ebp;
439 vm86->regs.eip = context->Eip;
440 vm86->regs.cs = context->SegCs;
441 vm86->regs.ds = context->SegDs;
442 vm86->regs.es = context->SegEs;
443 vm86->regs.fs = context->SegFs;
444 vm86->regs.gs = context->SegGs;
445 vm86->regs.ss = context->SegSs;
446 vm86->regs.eflags = context->EFlags;
448 #endif /* __HAVE_VM86 */
451 /***********************************************************************
454 * Set the register values from a sigcontext.
456 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
459 /* get %fs at time of the fault */
461 fs = FS_sig(sigcontext);
467 /* now restore a proper %fs for the fault handler */
468 if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext))) /* 16-bit mode */
470 fs = SYSLEVEL_Win16CurrentTeb;
473 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
475 /* retrieve pointer to vm86plus struct that was stored in vm86_enter */
476 struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
477 /* fetch the saved %fs on the stack */
478 fs = *(unsigned int *)ESP_sig(sigcontext);
480 /* get context from vm86 struct */
481 save_vm86_context( context, vm86 );
484 #endif /* __HAVE_VM86 */
488 context->Eax = EAX_sig(sigcontext);
489 context->Ebx = EBX_sig(sigcontext);
490 context->Ecx = ECX_sig(sigcontext);
491 context->Edx = EDX_sig(sigcontext);
492 context->Esi = ESI_sig(sigcontext);
493 context->Edi = EDI_sig(sigcontext);
494 context->Ebp = EBP_sig(sigcontext);
495 context->EFlags = EFL_sig(sigcontext);
496 context->Eip = EIP_sig(sigcontext);
497 context->Esp = ESP_sig(sigcontext);
498 context->SegCs = LOWORD(CS_sig(sigcontext));
499 context->SegDs = LOWORD(DS_sig(sigcontext));
500 context->SegEs = LOWORD(ES_sig(sigcontext));
501 context->SegSs = LOWORD(SS_sig(sigcontext));
503 context->SegGs = LOWORD(GS_sig(sigcontext));
505 context->SegGs = __get_gs();
510 /***********************************************************************
513 * Build a sigcontext from the register values.
515 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
518 /* check if exception occurred in vm86 mode */
519 if ((void *)EIP_sig(sigcontext) == vm86_return &&
520 IS_SELECTOR_SYSTEM(CS_sig(sigcontext)))
522 /* retrieve pointer to vm86plus struct that was stored in vm86_enter */
523 struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
524 restore_vm86_context( context, vm86 );
527 #endif /* __HAVE_VM86 */
529 EAX_sig(sigcontext) = context->Eax;
530 EBX_sig(sigcontext) = context->Ebx;
531 ECX_sig(sigcontext) = context->Ecx;
532 EDX_sig(sigcontext) = context->Edx;
533 ESI_sig(sigcontext) = context->Esi;
534 EDI_sig(sigcontext) = context->Edi;
535 EBP_sig(sigcontext) = context->Ebp;
536 EFL_sig(sigcontext) = context->EFlags;
537 EIP_sig(sigcontext) = context->Eip;
538 ESP_sig(sigcontext) = context->Esp;
539 CS_sig(sigcontext) = context->SegCs;
540 DS_sig(sigcontext) = context->SegDs;
541 ES_sig(sigcontext) = context->SegEs;
542 SS_sig(sigcontext) = context->SegSs;
544 FS_sig(sigcontext) = context->SegFs;
546 __set_fs( context->SegFs );
549 GS_sig(sigcontext) = context->SegGs;
551 __set_gs( context->SegGs );
556 /***********************************************************************
559 * Set the FPU context from a sigcontext.
561 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
564 if (FPU_sig(sigcontext))
566 context->FloatSave = *FPU_sig(sigcontext);
571 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
572 #endif /* __GNUC__ */
576 /***********************************************************************
579 * Restore the FPU context to a sigcontext.
581 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
583 /* reset the current interrupt status */
584 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
586 if (FPU_sig(sigcontext))
588 *FPU_sig(sigcontext) = context->FloatSave;
593 /* avoid nested exceptions */
594 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
595 #endif /* __GNUC__ */
599 /**********************************************************************
602 * Get the FPU exception code from the FPU status.
604 static inline DWORD get_fpu_code( const CONTEXT *context )
606 DWORD status = context->FloatSave.StatusWord;
608 if (status & 0x01) /* IE */
610 if (status & 0x40) /* SF */
611 return EXCEPTION_FLT_STACK_CHECK;
613 return EXCEPTION_FLT_INVALID_OPERATION;
615 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
616 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
617 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
618 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
619 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
620 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
624 /***********************************************************************
627 * Unblock signals. Called from EXC_RtlRaiseException.
629 void SIGNAL_Unblock( void )
631 sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
635 /**********************************************************************
638 * Implementation of SIGSEGV handler.
640 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
642 EXCEPTION_RECORD rec;
643 DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
646 /* we want the page-fault case to be fast */
647 if (trap_code == T_PAGEFLT)
648 if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
651 rec.ExceptionRecord = NULL;
652 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
653 rec.ExceptionAddress = (LPVOID)context->Eip;
654 rec.NumberParameters = 0;
658 case T_OFLOW: /* Overflow exception */
659 rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
661 case T_BOUND: /* Bound range exception */
662 rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
664 case T_PRIVINFLT: /* Invalid opcode exception */
665 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
667 case T_STKFLT: /* Stack fault */
668 rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
670 case T_SEGNPFLT: /* Segment not present exception */
671 case T_PROTFLT: /* General protection fault */
672 case T_UNKNOWN: /* Unknown fault code */
673 if (INSTR_EmulateInstruction( context )) return;
674 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
676 case T_PAGEFLT: /* Page fault */
678 rec.NumberParameters = 2;
679 rec.ExceptionInformation[0] = (err_code & 2) != 0;
680 rec.ExceptionInformation[1] = (DWORD)cr2;
682 rec.ExceptionCode = page_fault_code;
684 case T_ALIGNFLT: /* Alignment check exception */
685 /* FIXME: pass through exception handler first? */
686 if (context->EFlags & 0x00040000)
688 /* Disable AC flag, return */
689 context->EFlags &= ~0x00040000;
692 rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
695 ERR( "Got unexpected trap %d\n", trap_code );
697 case T_NMI: /* NMI interrupt */
698 case T_DNA: /* Device not available exception */
699 case T_DOUBLEFLT: /* Double fault exception */
700 case T_TSSFLT: /* Invalid TSS exception */
701 case T_RESERVED: /* Unknown exception */
702 case T_MCHK: /* Machine check exception */
704 case T_CACHEFLT: /* Cache flush exception */
706 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
709 EXC_RtlRaiseException( &rec, context );
713 /**********************************************************************
716 * Implementation of SIGTRAP handler.
718 static void do_trap( CONTEXT *context, int trap_code )
720 EXCEPTION_RECORD rec;
722 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
723 rec.ExceptionRecord = NULL;
724 rec.ExceptionAddress = (LPVOID)context->Eip;
725 rec.NumberParameters = 0;
729 case T_TRCTRAP: /* Single-step exception */
730 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
731 context->EFlags &= ~0x100; /* clear single-step flag */
733 case T_BPTFLT: /* Breakpoint exception */
734 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
737 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
740 EXC_RtlRaiseException( &rec, context );
744 /**********************************************************************
747 * Implementation of SIGFPE handler
749 static void do_fpe( CONTEXT *context, int trap_code )
751 EXCEPTION_RECORD rec;
755 case T_DIVIDE: /* Division by zero exception */
756 rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
758 case T_FPOPFLT: /* Coprocessor segment overrun */
759 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
761 case T_ARITHTRAP: /* Floating point exception */
762 case T_UNKNOWN: /* Unknown fault code */
763 rec.ExceptionCode = get_fpu_code( context );
766 ERR( "Got unexpected trap %d\n", trap_code );
767 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
770 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
771 rec.ExceptionRecord = NULL;
772 rec.ExceptionAddress = (LPVOID)context->Eip;
773 rec.NumberParameters = 0;
774 EXC_RtlRaiseException( &rec, context );
779 /**********************************************************************
782 * Handler for SIGUSR2, which we use to set the vm86 pending flag.
784 static void set_vm86_pend( CONTEXT *context )
786 EXCEPTION_RECORD rec;
787 TEB *teb = NtCurrentTeb();
789 rec.ExceptionCode = EXCEPTION_VM86_STI;
790 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
791 rec.ExceptionRecord = NULL;
792 rec.NumberParameters = 1;
793 rec.ExceptionInformation[0] = 0;
795 /* __wine_enter_vm86() merges the vm86_pending flag in safely */
796 teb->vm86_pending |= VIP_MASK;
797 /* see if we were in VM86 mode */
798 if (context->EFlags & 0x00020000)
800 /* seems so, also set flag in signal context */
801 if (context->EFlags & VIP_MASK) return;
802 context->EFlags |= VIP_MASK;
803 if (context->EFlags & VIF_MASK) {
804 /* VIF is set, throw exception */
805 teb->vm86_pending = 0;
806 rec.ExceptionAddress = (LPVOID)context->Eip;
807 EXC_RtlRaiseException( &rec, context );
810 else if (teb->vm86_ptr)
812 /* not in VM86, but possibly setting up for it */
813 struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
814 if (vm86->regs.eflags & VIP_MASK) return;
815 vm86->regs.eflags |= VIP_MASK;
816 if (vm86->regs.eflags & VIF_MASK) {
817 /* VIF is set, throw exception */
819 teb->vm86_pending = 0;
820 save_vm86_context( &vcontext, vm86 );
821 rec.ExceptionAddress = (LPVOID)vcontext.Eip;
822 EXC_RtlRaiseException( &rec, &vcontext );
823 restore_vm86_context( &vcontext, vm86 );
825 /* must also save here */
826 *(CONTEXT*)(teb->vm86_ctx) = vcontext;
833 /**********************************************************************
836 * Handler for SIGUSR2.
837 * We use it to signal that the running __wine_enter_vm86() should
838 * immediately set VIP_MASK, causing pending events to be handled
839 * as early as possible.
841 static HANDLER_DEF(usr2_handler)
845 save_context( &context, HANDLER_CONTEXT );
846 set_vm86_pend( &context );
847 restore_context( &context, HANDLER_CONTEXT );
851 /**********************************************************************
854 * Handler for SIGALRM.
855 * Increases the alarm counter and sets the vm86 pending flag.
857 static HANDLER_DEF(alrm_handler)
861 save_context( &context, HANDLER_CONTEXT );
862 NtCurrentTeb()->alarms++;
863 set_vm86_pend( &context );
864 restore_context( &context, HANDLER_CONTEXT );
866 #endif /* __HAVE_VM86 */
869 /**********************************************************************
872 * Handler for SIGSEGV and related errors.
874 static HANDLER_DEF(segv_handler)
877 save_context( &context, HANDLER_CONTEXT );
878 do_segv( &context, get_trap_code(HANDLER_CONTEXT),
879 get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
880 restore_context( &context, HANDLER_CONTEXT );
884 /**********************************************************************
887 * Handler for SIGTRAP.
889 static HANDLER_DEF(trap_handler)
892 save_context( &context, HANDLER_CONTEXT );
893 do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
894 restore_context( &context, HANDLER_CONTEXT );
898 /**********************************************************************
901 * Handler for SIGFPE.
903 static HANDLER_DEF(fpe_handler)
906 save_fpu( &context, HANDLER_CONTEXT );
907 save_context( &context, HANDLER_CONTEXT );
908 do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
909 restore_context( &context, HANDLER_CONTEXT );
910 restore_fpu( &context, HANDLER_CONTEXT );
914 /**********************************************************************
917 * Handler for SIGINT.
919 static HANDLER_DEF(int_handler)
921 EXCEPTION_RECORD rec;
924 save_context( &context, HANDLER_CONTEXT );
925 rec.ExceptionCode = CONTROL_C_EXIT;
926 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
927 rec.ExceptionRecord = NULL;
928 rec.ExceptionAddress = (LPVOID)context.Eip;
929 rec.NumberParameters = 0;
930 EXC_RtlRaiseException( &rec, &context );
931 restore_context( &context, HANDLER_CONTEXT );
935 /***********************************************************************
938 * Set a signal handler
940 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
942 struct sigaction sig_act;
945 if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
947 struct kernel_sigaction sig_act;
948 sig_act.ksa_handler = func;
949 sig_act.ksa_flags = SA_RESTART;
950 sig_act.ksa_mask = (1 << (SIGINT-1)) |
952 /* point to the top of the stack */
953 sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
954 return wine_sigaction( sig, &sig_act, NULL );
957 sig_act.sa_handler = func;
958 sigemptyset( &sig_act.sa_mask );
959 sigaddset( &sig_act.sa_mask, SIGINT );
960 sigaddset( &sig_act.sa_mask, SIGALRM );
963 sig_act.sa_flags = SA_RESTART;
964 #elif defined (__svr4__) || defined(_SCO_DS)
965 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
967 sig_act.sa_flags = 0;
971 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
973 return sigaction( sig, &sig_act, NULL );
977 /**********************************************************************
980 BOOL SIGNAL_Init(void)
982 int have_sigaltstack = 0;
984 #ifdef HAVE_SIGALTSTACK
985 struct sigaltstack ss;
986 if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
988 ss.ss_size = SIGNAL_STACK_SIZE;
990 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
992 /* sigaltstack may fail because the kernel is too old, or
993 because glibc is brain-dead. In the latter case a
994 direct system call should succeed. */
995 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
998 #endif /* HAVE_SIGALTSTACK */
1000 sigfillset( &all_sigs );
1002 /* automatic child reaping to avoid zombies */
1003 signal( SIGCHLD, SIG_IGN );
1005 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1006 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1007 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1008 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1010 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1013 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1017 if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
1018 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1024 perror("sigaction");
1030 /**********************************************************************
1033 * Enter vm86 mode with the specified register context.
1035 void __wine_enter_vm86( CONTEXT *context )
1037 EXCEPTION_RECORD rec;
1038 TEB *teb = NtCurrentTeb();
1040 struct vm86plus_struct vm86;
1042 memset( &vm86, 0, sizeof(vm86) );
1045 restore_vm86_context( context, &vm86 );
1046 /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1047 * so save it on entry, just in case */
1048 teb->vm86_pending |= (context->EFlags & VIP_MASK);
1049 /* Work around race conditions with signal handler
1050 * (avoiding sigprocmask for performance reasons) */
1051 teb->vm86_ptr = &vm86;
1052 vm86.regs.eflags |= teb->vm86_pending;
1053 /* Check for VIF|VIP here, since vm86_enter doesn't */
1054 if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1055 teb->vm86_ptr = NULL;
1056 teb->vm86_pending = 0;
1057 context->EFlags |= VIP_MASK;
1058 rec.ExceptionCode = EXCEPTION_VM86_STI;
1059 rec.ExceptionInformation[0] = 0;
1065 res = vm86_enter( &vm86 );
1071 } while (VM86_TYPE(res) == VM86_SIGNAL);
1073 teb->vm86_ctx = context;
1074 save_vm86_context( context, &vm86 );
1075 teb->vm86_ptr = NULL;
1076 teb->vm86_ctx = NULL;
1077 context->EFlags |= teb->vm86_pending;
1079 switch(VM86_TYPE(res))
1081 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1082 do_segv( context, T_PROTFLT, 0, 0 );
1084 case VM86_TRAP: /* return due to DOS-debugger request */
1085 do_trap( context, VM86_ARG(res) );
1087 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1088 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1090 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1091 teb->vm86_pending = 0;
1092 rec.ExceptionCode = EXCEPTION_VM86_STI;
1094 case VM86_PICRETURN: /* return due to pending PIC request */
1095 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1098 ERR( "unhandled result from vm86 mode %x\n", res );
1101 rec.ExceptionInformation[0] = VM86_ARG(res);
1103 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1104 rec.ExceptionRecord = NULL;
1105 rec.ExceptionAddress = (LPVOID)context->Eip;
1106 rec.NumberParameters = 1;
1107 EXC_RtlRaiseException( &rec, context );
1111 #else /* __HAVE_VM86 */
1112 void __wine_enter_vm86( CONTEXT *context )
1114 MESSAGE("vm86 mode not supported on this platform\n");
1116 #endif /* __HAVE_VM86 */
1118 /**********************************************************************
1119 * DbgBreakPoint (NTDLL.@)
1121 void WINAPI DbgBreakPoint(void);
1122 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1124 /**********************************************************************
1125 * DbgUserBreakPoint (NTDLL.@)
1127 void WINAPI DbgUserBreakPoint(void);
1128 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1130 #endif /* __i386__ */