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>
39 #include "selectors.h"
41 /***********************************************************************
42 * signal context platform-specific definitions
48 unsigned short sc_gs, __gsh;
49 unsigned short sc_fs, __fsh;
50 unsigned short sc_es, __esh;
51 unsigned short sc_ds, __dsh;
60 unsigned long sc_trapno;
63 unsigned short sc_cs, __csh;
64 unsigned long sc_eflags;
65 unsigned long esp_at_signal;
66 unsigned short sc_ss, __ssh;
68 unsigned long oldmask;
72 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
73 #define HANDLER_CONTEXT (&__context)
75 /* this is the sigaction structure from the Linux 2.1.20 kernel. */
76 struct kernel_sigaction
78 void (*ksa_handler)();
79 unsigned long ksa_mask;
80 unsigned long ksa_flags;
84 /* Similar to the sigaction function in libc, except it leaves alone the
85 restorer field, which is used to specify the signal stack address */
86 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
87 struct kernel_sigaction *old )
89 __asm__ __volatile__( "pushl %%ebx\n\t"
94 : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
100 #ifdef HAVE_SIGALTSTACK
101 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
102 static inline int wine_sigaltstack( const struct sigaltstack *new,
103 struct sigaltstack *old )
106 __asm__ __volatile__( "pushl %%ebx\n\t"
111 : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
112 if (ret >= 0) return 0;
118 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
120 int vm86_enter( void **vm86_ptr );
121 void vm86_return(void);
122 void vm86_return_end(void);
123 __ASM_GLOBAL_FUNC(vm86_enter,
125 "movl %esp, %ebp\n\t"
126 "movl $166,%eax\n\t" /*SYS_vm86*/
127 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
128 "movl (%ecx),%ecx\n\t"
130 "movl $1,%ebx\n\t" /*VM86_ENTER*/
131 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
134 ".globl " __ASM_NAME("vm86_return") "\n\t"
135 ".type " __ASM_NAME("vm86_return") ",@function\n"
136 __ASM_NAME("vm86_return") ":\n\t"
141 "testl %eax,%eax\n\t"
143 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
144 "je " __ASM_NAME("vm86_enter") "\n\t"
146 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
148 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
149 ".type " __ASM_NAME("vm86_return_end") ",@function\n"
150 __ASM_NAME("vm86_return_end") ":\n\t"
159 #define EAX_sig(context) ((context)->tf_eax)
160 #define EBX_sig(context) ((context)->tf_ebx)
161 #define ECX_sig(context) ((context)->tf_ecx)
162 #define EDX_sig(context) ((context)->tf_edx)
163 #define ESI_sig(context) ((context)->tf_esi)
164 #define EDI_sig(context) ((context)->tf_edi)
165 #define EBP_sig(context) ((context)->tf_ebp)
167 #define CS_sig(context) ((context)->tf_cs)
168 #define DS_sig(context) ((context)->tf_ds)
169 #define ES_sig(context) ((context)->tf_es)
170 #define SS_sig(context) ((context)->tf_ss)
172 #include <machine/frame.h>
173 typedef struct trapframe SIGCONTEXT;
175 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
176 #define HANDLER_CONTEXT __context
178 #define EFL_sig(context) ((context)->tf_eflags)
180 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
181 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
185 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
187 typedef struct sigcontext SIGCONTEXT;
189 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
190 #define HANDLER_CONTEXT __context
194 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
197 #include <sys/regset.h>
201 #include <sys/ucontext.h>
203 typedef struct ucontext SIGCONTEXT;
205 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
206 #define HANDLER_CONTEXT __context
208 #endif /* svr4 || SCO_DS */
214 unsigned long ContextFlags;
215 FLOATING_SAVE_AREA sc_float;
220 unsigned long sc_edi;
221 unsigned long sc_esi;
222 unsigned long sc_eax;
223 unsigned long sc_ebx;
224 unsigned long sc_ecx;
225 unsigned long sc_edx;
226 unsigned long sc_ebp;
227 unsigned long sc_eip;
229 unsigned long sc_eflags;
230 unsigned long sc_esp;
237 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__EMX__)
239 #define EAX_sig(context) ((context)->sc_eax)
240 #define EBX_sig(context) ((context)->sc_ebx)
241 #define ECX_sig(context) ((context)->sc_ecx)
242 #define EDX_sig(context) ((context)->sc_edx)
243 #define ESI_sig(context) ((context)->sc_esi)
244 #define EDI_sig(context) ((context)->sc_edi)
245 #define EBP_sig(context) ((context)->sc_ebp)
247 #define CS_sig(context) ((context)->sc_cs)
248 #define DS_sig(context) ((context)->sc_ds)
249 #define ES_sig(context) ((context)->sc_es)
250 #define SS_sig(context) ((context)->sc_ss)
252 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
253 * saved by the exception handling. duh.
254 * Actually they are in -current (have been for a while), and that
255 * patch now finally has been MFC'd to -stable too (Nov 15 1999).
256 * If you're running a system from the -stable branch older than that,
257 * like a 3.3-RELEASE, grab the patch from the ports tree:
258 * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
259 * (If its not yet there when you look, go here:
260 * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
263 #define FS_sig(context) ((context)->sc_fs)
264 #define GS_sig(context) ((context)->sc_gs)
268 #define FS_sig(context) ((context)->sc_fs)
269 #define GS_sig(context) ((context)->sc_gs)
270 #define CR2_sig(context) ((context)->cr2)
271 #define TRAP_sig(context) ((context)->sc_trapno)
272 #define ERROR_sig(context) ((context)->sc_err)
273 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
277 #define EFL_sig(context) ((context)->sc_eflags)
279 #define EFL_sig(context) ((context)->sc_efl)
280 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
281 #define CR2_sig(context) ((context)->sc_err)
282 #define TRAP_sig(context) ((context)->sc_trapno)
285 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
286 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
288 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
290 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
296 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
297 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
298 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
299 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
300 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
301 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
302 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
304 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
305 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
306 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
307 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
309 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
310 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
312 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
314 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
316 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
318 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
321 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
324 #endif /* svr4 || SCO_DS */
327 /* exception code definitions (already defined by FreeBSD/NetBSD) */
328 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
329 #define T_DIVIDE 0 /* Division by zero exception */
330 #define T_TRCTRAP 1 /* Single-step exception */
331 #define T_NMI 2 /* NMI interrupt */
332 #define T_BPTFLT 3 /* Breakpoint exception */
333 #define T_OFLOW 4 /* Overflow exception */
334 #define T_BOUND 5 /* Bound range exception */
335 #define T_PRIVINFLT 6 /* Invalid opcode exception */
336 #define T_DNA 7 /* Device not available exception */
337 #define T_DOUBLEFLT 8 /* Double fault exception */
338 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
339 #define T_TSSFLT 10 /* Invalid TSS exception */
340 #define T_SEGNPFLT 11 /* Segment not present exception */
341 #define T_STKFLT 12 /* Stack fault */
342 #define T_PROTFLT 13 /* General protection fault */
343 #define T_PAGEFLT 14 /* Page fault */
344 #define T_RESERVED 15 /* Unknown exception */
345 #define T_ARITHTRAP 16 /* Floating point exception */
346 #define T_ALIGNFLT 17 /* Alignment check exception */
347 #define T_MCHK 18 /* Machine check exception */
348 #define T_CACHEFLT 19 /* Cache flush exception */
350 #if defined(__NetBSD__)
351 #define T_MCHK 19 /* Machine check exception */
354 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
356 #include "wine/exception.h"
358 #include "stackframe.h"
362 #include "syslevel.h"
363 #include "debugtools.h"
365 DEFAULT_DEBUG_CHANNEL(seh);
367 static sigset_t all_sigs;
370 /***********************************************************************
373 * Get the trap code for a signal.
375 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
378 return TRAP_sig(sigcontext);
380 return T_UNKNOWN; /* unknown trap code */
384 /***********************************************************************
387 * Get the error code for a signal.
389 static inline int get_error_code( const SIGCONTEXT *sigcontext )
392 return ERROR_sig(sigcontext);
398 /***********************************************************************
401 * Get the CR2 value for a signal.
403 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
406 return (void *)CR2_sig(sigcontext);
414 /***********************************************************************
417 * Set the register values from a vm86 structure.
419 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
421 context->Eax = vm86->regs.eax;
422 context->Ebx = vm86->regs.ebx;
423 context->Ecx = vm86->regs.ecx;
424 context->Edx = vm86->regs.edx;
425 context->Esi = vm86->regs.esi;
426 context->Edi = vm86->regs.edi;
427 context->Esp = vm86->regs.esp;
428 context->Ebp = vm86->regs.ebp;
429 context->Eip = vm86->regs.eip;
430 context->SegCs = vm86->regs.cs;
431 context->SegDs = vm86->regs.ds;
432 context->SegEs = vm86->regs.es;
433 context->SegFs = vm86->regs.fs;
434 context->SegGs = vm86->regs.gs;
435 context->SegSs = vm86->regs.ss;
436 context->EFlags = vm86->regs.eflags;
440 /***********************************************************************
441 * restore_vm86_context
443 * Build a vm86 structure from the register values.
445 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
447 vm86->regs.eax = context->Eax;
448 vm86->regs.ebx = context->Ebx;
449 vm86->regs.ecx = context->Ecx;
450 vm86->regs.edx = context->Edx;
451 vm86->regs.esi = context->Esi;
452 vm86->regs.edi = context->Edi;
453 vm86->regs.esp = context->Esp;
454 vm86->regs.ebp = context->Ebp;
455 vm86->regs.eip = context->Eip;
456 vm86->regs.cs = context->SegCs;
457 vm86->regs.ds = context->SegDs;
458 vm86->regs.es = context->SegEs;
459 vm86->regs.fs = context->SegFs;
460 vm86->regs.gs = context->SegGs;
461 vm86->regs.ss = context->SegSs;
462 vm86->regs.eflags = context->EFlags;
464 #endif /* __HAVE_VM86 */
467 /***********************************************************************
470 * Set the register values from a sigcontext.
472 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
475 /* get %fs at time of the fault */
477 fs = FS_sig(sigcontext);
483 /* now restore a proper %fs for the fault handler */
484 if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext))) /* 16-bit mode */
486 fs = SYSLEVEL_Win16CurrentTeb;
489 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
491 /* fetch the saved %fs on the stack */
492 fs = *(unsigned int *)ESP_sig(sigcontext);
493 if (EAX_sig(sigcontext) == VM86_EAX) {
494 struct vm86plus_struct *vm86;
496 /* retrieve pointer to vm86plus struct that was stored in vm86_enter
497 * (but we could also get if from teb->vm86_ptr) */
498 vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
499 /* get context from vm86 struct */
500 save_vm86_context( context, vm86 );
504 #endif /* __HAVE_VM86 */
508 context->Eax = EAX_sig(sigcontext);
509 context->Ebx = EBX_sig(sigcontext);
510 context->Ecx = ECX_sig(sigcontext);
511 context->Edx = EDX_sig(sigcontext);
512 context->Esi = ESI_sig(sigcontext);
513 context->Edi = EDI_sig(sigcontext);
514 context->Ebp = EBP_sig(sigcontext);
515 context->EFlags = EFL_sig(sigcontext);
516 context->Eip = EIP_sig(sigcontext);
517 context->Esp = ESP_sig(sigcontext);
518 context->SegCs = LOWORD(CS_sig(sigcontext));
519 context->SegDs = LOWORD(DS_sig(sigcontext));
520 context->SegEs = LOWORD(ES_sig(sigcontext));
521 context->SegSs = LOWORD(SS_sig(sigcontext));
523 context->SegGs = LOWORD(GS_sig(sigcontext));
525 context->SegGs = __get_gs();
530 /***********************************************************************
533 * Build a sigcontext from the register values.
535 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
538 /* check if exception occurred in vm86 mode */
539 if ((void *)EIP_sig(sigcontext) == vm86_return &&
540 IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
541 EAX_sig(sigcontext) == VM86_EAX)
543 /* retrieve pointer to vm86plus struct that was stored in vm86_enter
544 * (but we could also get it from teb->vm86_ptr) */
545 struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)(ESP_sig(sigcontext) + sizeof(int));
546 restore_vm86_context( context, vm86 );
549 #endif /* __HAVE_VM86 */
551 EAX_sig(sigcontext) = context->Eax;
552 EBX_sig(sigcontext) = context->Ebx;
553 ECX_sig(sigcontext) = context->Ecx;
554 EDX_sig(sigcontext) = context->Edx;
555 ESI_sig(sigcontext) = context->Esi;
556 EDI_sig(sigcontext) = context->Edi;
557 EBP_sig(sigcontext) = context->Ebp;
558 EFL_sig(sigcontext) = context->EFlags;
559 EIP_sig(sigcontext) = context->Eip;
560 ESP_sig(sigcontext) = context->Esp;
561 CS_sig(sigcontext) = context->SegCs;
562 DS_sig(sigcontext) = context->SegDs;
563 ES_sig(sigcontext) = context->SegEs;
564 SS_sig(sigcontext) = context->SegSs;
566 FS_sig(sigcontext) = context->SegFs;
568 __set_fs( context->SegFs );
571 GS_sig(sigcontext) = context->SegGs;
573 __set_gs( context->SegGs );
578 /***********************************************************************
581 * Set the FPU context from a sigcontext.
583 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
586 if (FPU_sig(sigcontext))
588 context->FloatSave = *FPU_sig(sigcontext);
593 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
594 #endif /* __GNUC__ */
598 /***********************************************************************
601 * Restore the FPU context to a sigcontext.
603 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
605 /* reset the current interrupt status */
606 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
608 if (FPU_sig(sigcontext))
610 *FPU_sig(sigcontext) = context->FloatSave;
615 /* avoid nested exceptions */
616 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
617 #endif /* __GNUC__ */
621 /**********************************************************************
624 * Get the FPU exception code from the FPU status.
626 static inline DWORD get_fpu_code( const CONTEXT *context )
628 DWORD status = context->FloatSave.StatusWord;
630 if (status & 0x01) /* IE */
632 if (status & 0x40) /* SF */
633 return EXCEPTION_FLT_STACK_CHECK;
635 return EXCEPTION_FLT_INVALID_OPERATION;
637 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
638 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
639 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
640 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
641 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
642 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
646 /***********************************************************************
649 * Unblock signals. Called from EXC_RtlRaiseException.
651 void SIGNAL_Unblock( void )
653 sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
657 /**********************************************************************
660 * Implementation of SIGSEGV handler.
662 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
664 EXCEPTION_RECORD rec;
665 DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
668 /* we want the page-fault case to be fast */
669 if (trap_code == T_PAGEFLT)
670 if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
673 rec.ExceptionRecord = NULL;
674 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
675 rec.ExceptionAddress = (LPVOID)context->Eip;
676 rec.NumberParameters = 0;
680 case T_OFLOW: /* Overflow exception */
681 rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
683 case T_BOUND: /* Bound range exception */
684 rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
686 case T_PRIVINFLT: /* Invalid opcode exception */
687 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
689 case T_STKFLT: /* Stack fault */
690 rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
692 case T_SEGNPFLT: /* Segment not present exception */
693 case T_PROTFLT: /* General protection fault */
694 case T_UNKNOWN: /* Unknown fault code */
695 if (INSTR_EmulateInstruction( context )) return;
696 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
698 case T_PAGEFLT: /* Page fault */
700 rec.NumberParameters = 2;
701 rec.ExceptionInformation[0] = (err_code & 2) != 0;
702 rec.ExceptionInformation[1] = (DWORD)cr2;
704 rec.ExceptionCode = page_fault_code;
706 case T_ALIGNFLT: /* Alignment check exception */
707 /* FIXME: pass through exception handler first? */
708 if (context->EFlags & 0x00040000)
710 /* Disable AC flag, return */
711 context->EFlags &= ~0x00040000;
714 rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
717 ERR( "Got unexpected trap %d\n", trap_code );
719 case T_NMI: /* NMI interrupt */
720 case T_DNA: /* Device not available exception */
721 case T_DOUBLEFLT: /* Double fault exception */
722 case T_TSSFLT: /* Invalid TSS exception */
723 case T_RESERVED: /* Unknown exception */
724 case T_MCHK: /* Machine check exception */
726 case T_CACHEFLT: /* Cache flush exception */
728 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
731 EXC_RtlRaiseException( &rec, context );
735 /**********************************************************************
738 * Implementation of SIGTRAP handler.
740 static void do_trap( CONTEXT *context, int trap_code )
742 EXCEPTION_RECORD rec;
744 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
745 rec.ExceptionRecord = NULL;
746 rec.ExceptionAddress = (LPVOID)context->Eip;
747 rec.NumberParameters = 0;
751 case T_TRCTRAP: /* Single-step exception */
752 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
753 context->EFlags &= ~0x100; /* clear single-step flag */
755 case T_BPTFLT: /* Breakpoint exception */
756 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
759 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
762 EXC_RtlRaiseException( &rec, context );
766 /**********************************************************************
769 * Implementation of SIGFPE handler
771 static void do_fpe( CONTEXT *context, int trap_code )
773 EXCEPTION_RECORD rec;
777 case T_DIVIDE: /* Division by zero exception */
778 rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
780 case T_FPOPFLT: /* Coprocessor segment overrun */
781 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
783 case T_ARITHTRAP: /* Floating point exception */
784 case T_UNKNOWN: /* Unknown fault code */
785 rec.ExceptionCode = get_fpu_code( context );
788 ERR( "Got unexpected trap %d\n", trap_code );
789 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
792 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
793 rec.ExceptionRecord = NULL;
794 rec.ExceptionAddress = (LPVOID)context->Eip;
795 rec.NumberParameters = 0;
796 EXC_RtlRaiseException( &rec, context );
801 /**********************************************************************
804 * Handler for SIGUSR2, which we use to set the vm86 pending flag.
806 static void set_vm86_pend( CONTEXT *context )
808 EXCEPTION_RECORD rec;
809 TEB *teb = NtCurrentTeb();
810 struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
812 rec.ExceptionCode = EXCEPTION_VM86_STI;
813 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
814 rec.ExceptionRecord = NULL;
815 rec.NumberParameters = 1;
816 rec.ExceptionInformation[0] = 0;
818 /* __wine_enter_vm86() merges the vm86_pending flag in safely */
819 teb->vm86_pending |= VIP_MASK;
820 /* see if we were in VM86 mode */
821 if (context->EFlags & 0x00020000)
823 /* seems so, also set flag in signal context */
824 if (context->EFlags & VIP_MASK) return;
825 context->EFlags |= VIP_MASK;
826 vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
827 if (context->EFlags & VIF_MASK) {
828 /* VIF is set, throw exception */
829 teb->vm86_pending = 0;
830 teb->vm86_ptr = NULL;
831 rec.ExceptionAddress = (LPVOID)context->Eip;
832 EXC_RtlRaiseException( &rec, context );
833 teb->vm86_ptr = vm86;
838 /* not in VM86, but possibly setting up for it */
839 if (vm86->regs.eflags & VIP_MASK) return;
840 vm86->regs.eflags |= VIP_MASK;
841 if (((char*)context->Eip >= (char*)vm86_return) &&
842 ((char*)context->Eip <= (char*)vm86_return_end) &&
843 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
844 /* exiting from VM86, can't throw */
847 if (vm86->regs.eflags & VIF_MASK) {
848 /* VIF is set, throw exception */
850 teb->vm86_pending = 0;
851 teb->vm86_ptr = NULL;
852 save_vm86_context( &vcontext, vm86 );
853 rec.ExceptionAddress = (LPVOID)vcontext.Eip;
854 EXC_RtlRaiseException( &rec, &vcontext );
855 teb->vm86_ptr = vm86;
856 restore_vm86_context( &vcontext, vm86 );
862 /**********************************************************************
865 * Handler for SIGUSR2.
866 * We use it to signal that the running __wine_enter_vm86() should
867 * immediately set VIP_MASK, causing pending events to be handled
868 * as early as possible.
870 static HANDLER_DEF(usr2_handler)
874 save_context( &context, HANDLER_CONTEXT );
875 set_vm86_pend( &context );
876 restore_context( &context, HANDLER_CONTEXT );
880 /**********************************************************************
883 * Handler for SIGALRM.
884 * Increases the alarm counter and sets the vm86 pending flag.
886 static HANDLER_DEF(alrm_handler)
890 save_context( &context, HANDLER_CONTEXT );
891 NtCurrentTeb()->alarms++;
892 set_vm86_pend( &context );
893 restore_context( &context, HANDLER_CONTEXT );
895 #endif /* __HAVE_VM86 */
898 /**********************************************************************
901 * Handler for SIGSEGV and related errors.
903 static HANDLER_DEF(segv_handler)
906 save_context( &context, HANDLER_CONTEXT );
907 do_segv( &context, get_trap_code(HANDLER_CONTEXT),
908 get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
909 restore_context( &context, HANDLER_CONTEXT );
913 /**********************************************************************
916 * Handler for SIGTRAP.
918 static HANDLER_DEF(trap_handler)
921 save_context( &context, HANDLER_CONTEXT );
922 do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
923 restore_context( &context, HANDLER_CONTEXT );
927 /**********************************************************************
930 * Handler for SIGFPE.
932 static HANDLER_DEF(fpe_handler)
935 save_fpu( &context, HANDLER_CONTEXT );
936 save_context( &context, HANDLER_CONTEXT );
937 do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
938 restore_context( &context, HANDLER_CONTEXT );
939 restore_fpu( &context, HANDLER_CONTEXT );
943 /**********************************************************************
946 * Handler for SIGINT.
948 static HANDLER_DEF(int_handler)
950 EXCEPTION_RECORD rec;
953 save_context( &context, HANDLER_CONTEXT );
954 rec.ExceptionCode = CONTROL_C_EXIT;
955 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
956 rec.ExceptionRecord = NULL;
957 rec.ExceptionAddress = (LPVOID)context.Eip;
958 rec.NumberParameters = 0;
959 EXC_RtlRaiseException( &rec, &context );
960 restore_context( &context, HANDLER_CONTEXT );
964 /***********************************************************************
967 * Set a signal handler
969 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
971 struct sigaction sig_act;
974 if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
976 struct kernel_sigaction sig_act;
977 sig_act.ksa_handler = func;
978 sig_act.ksa_flags = SA_RESTART;
979 sig_act.ksa_mask = (1 << (SIGINT-1)) |
981 /* point to the top of the stack */
982 sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
983 return wine_sigaction( sig, &sig_act, NULL );
986 sig_act.sa_handler = func;
987 sigemptyset( &sig_act.sa_mask );
988 sigaddset( &sig_act.sa_mask, SIGINT );
989 sigaddset( &sig_act.sa_mask, SIGALRM );
992 sig_act.sa_flags = SA_RESTART;
993 #elif defined (__svr4__) || defined(_SCO_DS)
994 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
996 sig_act.sa_flags = 0;
1000 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1002 return sigaction( sig, &sig_act, NULL );
1006 /**********************************************************************
1009 BOOL SIGNAL_Init(void)
1011 int have_sigaltstack = 0;
1013 #ifdef HAVE_SIGALTSTACK
1014 struct sigaltstack ss;
1015 if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1017 ss.ss_size = SIGNAL_STACK_SIZE;
1019 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1021 /* sigaltstack may fail because the kernel is too old, or
1022 because glibc is brain-dead. In the latter case a
1023 direct system call should succeed. */
1024 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1027 #endif /* HAVE_SIGALTSTACK */
1029 sigfillset( &all_sigs );
1031 /* automatic child reaping to avoid zombies */
1032 signal( SIGCHLD, SIG_IGN );
1034 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1035 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1036 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1037 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1039 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1042 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1046 if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
1047 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1053 perror("sigaction");
1058 /**********************************************************************
1061 void SIGNAL_Reset(void)
1065 /* block the async signals */
1066 sigemptyset( &block_set );
1067 sigaddset( &block_set, SIGALRM );
1068 sigaddset( &block_set, SIGIO );
1069 sigaddset( &block_set, SIGHUP );
1070 sigaddset( &block_set, SIGUSR2 );
1071 sigprocmask( SIG_BLOCK, &block_set, NULL );
1073 /* restore default handlers */
1074 signal( SIGINT, SIG_DFL );
1075 signal( SIGFPE, SIG_DFL );
1076 signal( SIGSEGV, SIG_DFL );
1077 signal( SIGILL, SIG_DFL );
1079 signal( SIGBUS, SIG_DFL );
1082 signal( SIGTRAP, SIG_DFL );
1088 /**********************************************************************
1091 * Enter vm86 mode with the specified register context.
1093 void __wine_enter_vm86( CONTEXT *context )
1095 EXCEPTION_RECORD rec;
1096 TEB *teb = NtCurrentTeb();
1098 struct vm86plus_struct vm86;
1100 memset( &vm86, 0, sizeof(vm86) );
1103 restore_vm86_context( context, &vm86 );
1104 /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1105 * so save it on entry, just in case */
1106 teb->vm86_pending |= (context->EFlags & VIP_MASK);
1107 /* Work around race conditions with signal handler
1108 * (avoiding sigprocmask for performance reasons) */
1109 teb->vm86_ptr = &vm86;
1110 vm86.regs.eflags |= teb->vm86_pending;
1111 /* Check for VIF|VIP here, since vm86_enter doesn't */
1112 if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1113 teb->vm86_ptr = NULL;
1114 teb->vm86_pending = 0;
1115 context->EFlags |= VIP_MASK;
1116 rec.ExceptionCode = EXCEPTION_VM86_STI;
1117 rec.ExceptionInformation[0] = 0;
1123 res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1129 } while (VM86_TYPE(res) == VM86_SIGNAL);
1131 save_vm86_context( context, &vm86 );
1132 context->EFlags |= teb->vm86_pending;
1134 switch(VM86_TYPE(res))
1136 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1137 do_segv( context, T_PROTFLT, 0, 0 );
1139 case VM86_TRAP: /* return due to DOS-debugger request */
1140 do_trap( context, VM86_ARG(res) );
1142 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1143 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1145 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1146 teb->vm86_pending = 0;
1147 rec.ExceptionCode = EXCEPTION_VM86_STI;
1149 case VM86_PICRETURN: /* return due to pending PIC request */
1150 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1153 ERR( "unhandled result from vm86 mode %x\n", res );
1156 rec.ExceptionInformation[0] = VM86_ARG(res);
1158 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1159 rec.ExceptionRecord = NULL;
1160 rec.ExceptionAddress = (LPVOID)context->Eip;
1161 rec.NumberParameters = 1;
1162 EXC_RtlRaiseException( &rec, context );
1166 #else /* __HAVE_VM86 */
1167 void __wine_enter_vm86( CONTEXT *context )
1169 MESSAGE("vm86 mode not supported on this platform\n");
1171 #endif /* __HAVE_VM86 */
1173 /**********************************************************************
1174 * DbgBreakPoint (NTDLL.@)
1176 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1178 /**********************************************************************
1179 * DbgUserBreakPoint (NTDLL.@)
1181 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1183 #endif /* __i386__ */