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>
58 #include "wine/library.h"
59 #include "ntdll_misc.h"
60 #include "selectors.h"
62 /***********************************************************************
63 * signal context platform-specific definitions
69 unsigned short sc_gs, __gsh;
70 unsigned short sc_fs, __fsh;
71 unsigned short sc_es, __esh;
72 unsigned short sc_ds, __dsh;
81 unsigned long sc_trapno;
84 unsigned short sc_cs, __csh;
85 unsigned long sc_eflags;
86 unsigned long esp_at_signal;
87 unsigned short sc_ss, __ssh;
89 unsigned long oldmask;
93 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
94 #define HANDLER_CONTEXT (&__context)
96 /* this is the sigaction structure from the Linux 2.1.20 kernel. */
97 struct kernel_sigaction
99 void (*ksa_handler)();
100 unsigned long ksa_mask;
101 unsigned long ksa_flags;
105 /* Similar to the sigaction function in libc, except it leaves alone the
106 restorer field, which is used to specify the signal stack address */
107 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
108 struct kernel_sigaction *old )
110 __asm__ __volatile__( "pushl %%ebx\n\t"
115 : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
116 if (sig>=0) return 0;
121 #ifdef HAVE_SIGALTSTACK
122 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
123 static inline int wine_sigaltstack( const struct sigaltstack *new,
124 struct sigaltstack *old )
127 __asm__ __volatile__( "pushl %%ebx\n\t"
132 : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
133 if (ret >= 0) return 0;
139 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
141 int vm86_enter( void **vm86_ptr );
142 void vm86_return(void);
143 void vm86_return_end(void);
144 __ASM_GLOBAL_FUNC(vm86_enter,
146 "movl %esp, %ebp\n\t"
147 "movl $166,%eax\n\t" /*SYS_vm86*/
148 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
149 "movl (%ecx),%ecx\n\t"
151 "movl $1,%ebx\n\t" /*VM86_ENTER*/
152 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
156 ".globl " __ASM_NAME("vm86_return") "\n\t"
157 __ASM_FUNC("vm86_return") "\n"
158 __ASM_NAME("vm86_return") ":\n\t"
164 "testl %eax,%eax\n\t"
166 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
167 "je " __ASM_NAME("vm86_enter") "\n\t"
169 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
171 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
172 __ASM_FUNC("vm86_return_end") "\n"
173 __ASM_NAME("vm86_return_end") ":\n\t"
176 #ifdef HAVE_SYS_VM86_H
184 #define EAX_sig(context) ((context)->tf_eax)
185 #define EBX_sig(context) ((context)->tf_ebx)
186 #define ECX_sig(context) ((context)->tf_ecx)
187 #define EDX_sig(context) ((context)->tf_edx)
188 #define ESI_sig(context) ((context)->tf_esi)
189 #define EDI_sig(context) ((context)->tf_edi)
190 #define EBP_sig(context) ((context)->tf_ebp)
192 #define CS_sig(context) ((context)->tf_cs)
193 #define DS_sig(context) ((context)->tf_ds)
194 #define ES_sig(context) ((context)->tf_es)
195 #define SS_sig(context) ((context)->tf_ss)
197 #include <machine/frame.h>
198 typedef struct trapframe SIGCONTEXT;
200 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
201 #define HANDLER_CONTEXT __context
203 #define EFL_sig(context) ((context)->tf_eflags)
205 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
206 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
210 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
212 typedef struct sigcontext SIGCONTEXT;
214 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
215 #define HANDLER_CONTEXT __context
219 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
222 #include <sys/regset.h>
226 #include <sys/ucontext.h>
228 typedef struct ucontext SIGCONTEXT;
230 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
231 #define HANDLER_CONTEXT __context
233 #endif /* svr4 || SCO_DS */
239 unsigned long ContextFlags;
240 FLOATING_SAVE_AREA sc_float;
245 unsigned long sc_edi;
246 unsigned long sc_esi;
247 unsigned long sc_eax;
248 unsigned long sc_ebx;
249 unsigned long sc_ecx;
250 unsigned long sc_edx;
251 unsigned long sc_ebp;
252 unsigned long sc_eip;
254 unsigned long sc_eflags;
255 unsigned long sc_esp;
263 /* FIXME: This section is just here so it can compile, it's most likely
264 * completely wrong. */
268 unsigned short sc_gs, __gsh;
269 unsigned short sc_fs, __fsh;
270 unsigned short sc_es, __esh;
271 unsigned short sc_ds, __dsh;
272 unsigned long sc_edi;
273 unsigned long sc_esi;
274 unsigned long sc_ebp;
275 unsigned long sc_esp;
276 unsigned long sc_ebx;
277 unsigned long sc_edx;
278 unsigned long sc_ecx;
279 unsigned long sc_eax;
280 unsigned long sc_trapno;
281 unsigned long sc_err;
282 unsigned long sc_eip;
283 unsigned short sc_cs, __csh;
284 unsigned long sc_eflags;
285 unsigned long esp_at_signal;
286 unsigned short sc_ss, __ssh;
288 unsigned long oldmask;
292 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
293 #define HANDLER_CONTEXT (&__context)
295 #endif /* __CYGWIN__ */
297 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
298 defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
300 #define EAX_sig(context) ((context)->sc_eax)
301 #define EBX_sig(context) ((context)->sc_ebx)
302 #define ECX_sig(context) ((context)->sc_ecx)
303 #define EDX_sig(context) ((context)->sc_edx)
304 #define ESI_sig(context) ((context)->sc_esi)
305 #define EDI_sig(context) ((context)->sc_edi)
306 #define EBP_sig(context) ((context)->sc_ebp)
308 #define CS_sig(context) ((context)->sc_cs)
309 #define DS_sig(context) ((context)->sc_ds)
310 #define ES_sig(context) ((context)->sc_es)
311 #define FS_sig(context) ((context)->sc_fs)
312 #define GS_sig(context) ((context)->sc_gs)
313 #define SS_sig(context) ((context)->sc_ss)
315 #define TRAP_sig(context) ((context)->sc_trapno)
318 #define ERROR_sig(context) ((context)->sc_err)
322 #define ERROR_sig(context) ((context)->sc_err)
323 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
324 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
328 #define EFL_sig(context) ((context)->sc_efl)
329 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
330 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
332 #define EFL_sig(context) ((context)->sc_eflags)
335 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
336 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
338 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
340 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
346 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
347 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
348 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
349 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
350 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
351 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
352 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
354 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
355 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
356 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
357 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
359 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
360 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
362 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
364 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
366 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
368 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
371 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
374 #define FAULT_ADDRESS (__siginfo->si_addr)
376 #endif /* svr4 || SCO_DS */
379 /* exception code definitions (already defined by FreeBSD/NetBSD) */
380 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
381 #define T_DIVIDE 0 /* Division by zero exception */
382 #define T_TRCTRAP 1 /* Single-step exception */
383 #define T_NMI 2 /* NMI interrupt */
384 #define T_BPTFLT 3 /* Breakpoint exception */
385 #define T_OFLOW 4 /* Overflow exception */
386 #define T_BOUND 5 /* Bound range exception */
387 #define T_PRIVINFLT 6 /* Invalid opcode exception */
388 #define T_DNA 7 /* Device not available exception */
389 #define T_DOUBLEFLT 8 /* Double fault exception */
390 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
391 #define T_TSSFLT 10 /* Invalid TSS exception */
392 #define T_SEGNPFLT 11 /* Segment not present exception */
393 #define T_STKFLT 12 /* Stack fault */
394 #define T_PROTFLT 13 /* General protection fault */
395 #define T_PAGEFLT 14 /* Page fault */
396 #define T_RESERVED 15 /* Unknown exception */
397 #define T_ARITHTRAP 16 /* Floating point exception */
398 #define T_ALIGNFLT 17 /* Alignment check exception */
399 #define T_MCHK 18 /* Machine check exception */
400 #define T_CACHEFLT 19 /* Cache flush exception */
402 #if defined(__NetBSD__)
403 #define T_MCHK 19 /* Machine check exception */
406 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
408 #include "wine/exception.h"
411 #include "syslevel.h"
412 #include "wine/debug.h"
414 WINE_DEFAULT_DEBUG_CHANNEL(seh);
416 typedef int (*wine_signal_handler)(unsigned int sig);
418 static wine_signal_handler handlers[256];
420 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
422 /***********************************************************************
425 inline static int dispatch_signal(unsigned int sig)
427 if (handlers[sig] == NULL) return 0;
428 return handlers[sig](sig);
432 /***********************************************************************
435 * Get the trap code for a signal.
437 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
440 return TRAP_sig(sigcontext);
442 return T_UNKNOWN; /* unknown trap code */
446 /***********************************************************************
449 * Get the error code for a signal.
451 static inline int get_error_code( const SIGCONTEXT *sigcontext )
454 return ERROR_sig(sigcontext);
461 /***********************************************************************
464 * Set the register values from a vm86 structure.
466 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
468 context->Eax = vm86->regs.eax;
469 context->Ebx = vm86->regs.ebx;
470 context->Ecx = vm86->regs.ecx;
471 context->Edx = vm86->regs.edx;
472 context->Esi = vm86->regs.esi;
473 context->Edi = vm86->regs.edi;
474 context->Esp = vm86->regs.esp;
475 context->Ebp = vm86->regs.ebp;
476 context->Eip = vm86->regs.eip;
477 context->SegCs = vm86->regs.cs;
478 context->SegDs = vm86->regs.ds;
479 context->SegEs = vm86->regs.es;
480 context->SegFs = vm86->regs.fs;
481 context->SegGs = vm86->regs.gs;
482 context->SegSs = vm86->regs.ss;
483 context->EFlags = vm86->regs.eflags;
487 /***********************************************************************
488 * restore_vm86_context
490 * Build a vm86 structure from the register values.
492 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
494 vm86->regs.eax = context->Eax;
495 vm86->regs.ebx = context->Ebx;
496 vm86->regs.ecx = context->Ecx;
497 vm86->regs.edx = context->Edx;
498 vm86->regs.esi = context->Esi;
499 vm86->regs.edi = context->Edi;
500 vm86->regs.esp = context->Esp;
501 vm86->regs.ebp = context->Ebp;
502 vm86->regs.eip = context->Eip;
503 vm86->regs.cs = context->SegCs;
504 vm86->regs.ds = context->SegDs;
505 vm86->regs.es = context->SegEs;
506 vm86->regs.fs = context->SegFs;
507 vm86->regs.gs = context->SegGs;
508 vm86->regs.ss = context->SegSs;
509 vm86->regs.eflags = context->EFlags;
511 #endif /* __HAVE_VM86 */
514 /***********************************************************************
517 * Set the register values from a sigcontext.
519 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
521 /* get %fs and %gs at time of the fault */
523 context->SegFs = LOWORD(FS_sig(sigcontext));
525 context->SegFs = wine_get_fs();
528 context->SegGs = LOWORD(GS_sig(sigcontext));
530 context->SegGs = wine_get_gs();
533 /* now restore a proper %fs for the fault handler */
534 if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
535 !IS_SELECTOR_SYSTEM(SS_sig(sigcontext))) /* 16-bit mode */
538 * Win16 or DOS protected mode. Note that during switch
539 * from 16-bit mode to linear mode, CS may be set to system
540 * segment before FS is restored. Fortunately, in this case
541 * SS is still non-system segment. This is why both CS and SS
544 wine_set_fs( SYSLEVEL_Win16CurrentTeb );
545 wine_set_gs( NtCurrentTeb()->gs_sel );
548 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
550 unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
552 /* fetch the saved %fs on the stack */
553 wine_set_fs( stack[0] );
554 wine_set_gs( stack[1] );
555 if (EAX_sig(sigcontext) == VM86_EAX) {
556 /* retrieve pointer to vm86plus struct that was stored in vm86_enter
557 * (but we could also get if from teb->vm86_ptr) */
558 struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
559 /* get context from vm86 struct */
560 save_vm86_context( context, vm86 );
564 #endif /* __HAVE_VM86 */
565 else /* 32-bit mode */
568 wine_set_fs( FS_sig(sigcontext) );
571 wine_set_gs( GS_sig(sigcontext) );
575 context->Eax = EAX_sig(sigcontext);
576 context->Ebx = EBX_sig(sigcontext);
577 context->Ecx = ECX_sig(sigcontext);
578 context->Edx = EDX_sig(sigcontext);
579 context->Esi = ESI_sig(sigcontext);
580 context->Edi = EDI_sig(sigcontext);
581 context->Ebp = EBP_sig(sigcontext);
582 context->EFlags = EFL_sig(sigcontext);
583 context->Eip = EIP_sig(sigcontext);
584 context->Esp = ESP_sig(sigcontext);
585 context->SegCs = LOWORD(CS_sig(sigcontext));
586 context->SegDs = LOWORD(DS_sig(sigcontext));
587 context->SegEs = LOWORD(ES_sig(sigcontext));
588 context->SegSs = LOWORD(SS_sig(sigcontext));
592 /***********************************************************************
595 * Build a sigcontext from the register values.
597 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
600 /* check if exception occurred in vm86 mode */
601 if ((void *)EIP_sig(sigcontext) == vm86_return &&
602 IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
603 EAX_sig(sigcontext) == VM86_EAX)
605 unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
606 /* retrieve pointer to vm86plus struct that was stored in vm86_enter
607 * (but we could also get it from teb->vm86_ptr) */
608 struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
609 restore_vm86_context( context, vm86 );
612 #endif /* __HAVE_VM86 */
614 EAX_sig(sigcontext) = context->Eax;
615 EBX_sig(sigcontext) = context->Ebx;
616 ECX_sig(sigcontext) = context->Ecx;
617 EDX_sig(sigcontext) = context->Edx;
618 ESI_sig(sigcontext) = context->Esi;
619 EDI_sig(sigcontext) = context->Edi;
620 EBP_sig(sigcontext) = context->Ebp;
621 EFL_sig(sigcontext) = context->EFlags;
622 EIP_sig(sigcontext) = context->Eip;
623 ESP_sig(sigcontext) = context->Esp;
624 CS_sig(sigcontext) = context->SegCs;
625 DS_sig(sigcontext) = context->SegDs;
626 ES_sig(sigcontext) = context->SegEs;
627 SS_sig(sigcontext) = context->SegSs;
629 FS_sig(sigcontext) = context->SegFs;
631 wine_set_fs( context->SegFs );
634 GS_sig(sigcontext) = context->SegGs;
636 wine_set_gs( context->SegGs );
641 /***********************************************************************
644 * Handler initialization when the full context is not needed.
646 static void init_handler( const SIGCONTEXT *sigcontext )
648 /* restore a proper %fs for the fault handler */
649 if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
650 !IS_SELECTOR_SYSTEM(SS_sig(sigcontext))) /* 16-bit mode */
652 wine_set_fs( SYSLEVEL_Win16CurrentTeb );
653 wine_set_gs( NtCurrentTeb()->gs_sel );
656 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
658 /* fetch the saved %fs on the stack */
659 wine_set_fs( *(unsigned int *)ESP_sig(sigcontext) );
660 wine_set_gs( NtCurrentTeb()->gs_sel );
662 #endif /* __HAVE_VM86 */
663 else /* 32-bit mode, get %fs at time of the fault */
666 wine_set_fs( FS_sig(sigcontext) );
669 wine_set_gs( GS_sig(sigcontext) );
675 /***********************************************************************
678 * Set the FPU context from a sigcontext.
680 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
683 if (FPU_sig(sigcontext))
685 context->FloatSave = *FPU_sig(sigcontext);
690 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
691 #endif /* __GNUC__ */
695 /***********************************************************************
698 * Restore the FPU context to a sigcontext.
700 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
702 /* reset the current interrupt status */
703 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
705 if (FPU_sig(sigcontext))
707 *FPU_sig(sigcontext) = context->FloatSave;
712 /* avoid nested exceptions */
713 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
714 #endif /* __GNUC__ */
718 /**********************************************************************
721 * Get the FPU exception code from the FPU status.
723 static inline DWORD get_fpu_code( const CONTEXT *context )
725 DWORD status = context->FloatSave.StatusWord;
727 if (status & 0x01) /* IE */
729 if (status & 0x40) /* SF */
730 return EXCEPTION_FLT_STACK_CHECK;
732 return EXCEPTION_FLT_INVALID_OPERATION;
734 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
735 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
736 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
737 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
738 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
739 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
743 /**********************************************************************
746 * Implementation of SIGSEGV handler.
748 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
750 EXCEPTION_RECORD rec;
751 DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
754 /* we want the page-fault case to be fast */
755 if (trap_code == T_PAGEFLT)
756 if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
759 rec.ExceptionRecord = NULL;
760 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
761 rec.ExceptionAddress = (LPVOID)context->Eip;
762 rec.NumberParameters = 0;
766 case T_OFLOW: /* Overflow exception */
767 rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
769 case T_BOUND: /* Bound range exception */
770 rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
772 case T_PRIVINFLT: /* Invalid opcode exception */
773 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
775 case T_STKFLT: /* Stack fault */
776 rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
778 case T_SEGNPFLT: /* Segment not present exception */
779 case T_PROTFLT: /* General protection fault */
780 case T_UNKNOWN: /* Unknown fault code */
781 if (!(rec.ExceptionCode = INSTR_EmulateInstruction( context ))) return;
783 case T_PAGEFLT: /* Page fault */
785 rec.NumberParameters = 2;
786 rec.ExceptionInformation[0] = (err_code & 2) != 0;
787 rec.ExceptionInformation[1] = (DWORD)cr2;
789 rec.ExceptionCode = page_fault_code;
791 case T_ALIGNFLT: /* Alignment check exception */
792 /* FIXME: pass through exception handler first? */
793 if (context->EFlags & 0x00040000)
795 /* Disable AC flag, return */
796 context->EFlags &= ~0x00040000;
799 rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
802 ERR( "Got unexpected trap %d\n", trap_code );
804 case T_NMI: /* NMI interrupt */
805 case T_DNA: /* Device not available exception */
806 case T_DOUBLEFLT: /* Double fault exception */
807 case T_TSSFLT: /* Invalid TSS exception */
808 case T_RESERVED: /* Unknown exception */
809 case T_MCHK: /* Machine check exception */
811 case T_CACHEFLT: /* Cache flush exception */
813 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
816 EXC_RtlRaiseException( &rec, context );
820 /**********************************************************************
823 * Implementation of SIGTRAP handler.
825 static void do_trap( CONTEXT *context, int trap_code )
827 EXCEPTION_RECORD rec;
828 DWORD dr0, dr1, dr2, dr3, dr6, dr7;
830 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
831 rec.ExceptionRecord = NULL;
832 rec.ExceptionAddress = (LPVOID)context->Eip;
833 rec.NumberParameters = 0;
837 case T_TRCTRAP: /* Single-step exception */
838 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
839 if (context->EFlags & 0x100)
841 context->EFlags &= ~0x100; /* clear single-step flag */
843 else /* hardware breakpoint, fetch the debug registers */
845 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
846 NtGetContextThread(GetCurrentThread(), context);
847 /* do we really have a bp from a debug register ?
848 * if not, then someone did a kill(SIGTRAP) on us, and we
849 * shall return a breakpoint, not a single step exception
851 if (!(context->Dr6 & 0xf))
852 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
855 case T_BPTFLT: /* Breakpoint exception */
856 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
859 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
869 EXC_RtlRaiseException( &rec, context );
871 if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
872 dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
874 /* the debug registers have changed, set the new values */
875 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
876 NtSetContextThread(GetCurrentThread(), context);
881 /**********************************************************************
884 * Implementation of SIGFPE handler
886 static void do_fpe( CONTEXT *context, int trap_code )
888 EXCEPTION_RECORD rec;
892 case T_DIVIDE: /* Division by zero exception */
893 rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
895 case T_FPOPFLT: /* Coprocessor segment overrun */
896 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
898 case T_ARITHTRAP: /* Floating point exception */
899 case T_UNKNOWN: /* Unknown fault code */
900 rec.ExceptionCode = get_fpu_code( context );
903 ERR( "Got unexpected trap %d\n", trap_code );
904 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
907 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
908 rec.ExceptionRecord = NULL;
909 rec.ExceptionAddress = (LPVOID)context->Eip;
910 rec.NumberParameters = 0;
911 EXC_RtlRaiseException( &rec, context );
916 /**********************************************************************
919 * Handler for SIGUSR2, which we use to set the vm86 pending flag.
921 static void set_vm86_pend( CONTEXT *context )
923 EXCEPTION_RECORD rec;
924 TEB *teb = NtCurrentTeb();
925 struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
927 rec.ExceptionCode = EXCEPTION_VM86_STI;
928 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
929 rec.ExceptionRecord = NULL;
930 rec.NumberParameters = 1;
931 rec.ExceptionInformation[0] = 0;
933 /* __wine_enter_vm86() merges the vm86_pending flag in safely */
934 teb->vm86_pending |= VIP_MASK;
935 /* see if we were in VM86 mode */
936 if (context->EFlags & 0x00020000)
938 /* seems so, also set flag in signal context */
939 if (context->EFlags & VIP_MASK) return;
940 context->EFlags |= VIP_MASK;
941 vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
942 if (context->EFlags & VIF_MASK) {
943 /* VIF is set, throw exception */
944 teb->vm86_pending = 0;
945 teb->vm86_ptr = NULL;
946 rec.ExceptionAddress = (LPVOID)context->Eip;
947 EXC_RtlRaiseException( &rec, context );
949 * FIXME: EXC_RtlRaiseException has unblocked all signals.
950 * If we receive nested SIGUSR2 here, VM86 event
951 * handling may lock up!
953 teb->vm86_ptr = vm86;
958 /* not in VM86, but possibly setting up for it */
959 if (vm86->regs.eflags & VIP_MASK) return;
960 vm86->regs.eflags |= VIP_MASK;
961 if (((char*)context->Eip >= (char*)vm86_return) &&
962 ((char*)context->Eip <= (char*)vm86_return_end) &&
963 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
964 /* exiting from VM86, can't throw */
967 if (vm86->regs.eflags & VIF_MASK) {
968 /* VIF is set, throw exception */
970 teb->vm86_pending = 0;
971 teb->vm86_ptr = NULL;
972 save_vm86_context( &vcontext, vm86 );
973 rec.ExceptionAddress = (LPVOID)vcontext.Eip;
974 EXC_RtlRaiseException( &rec, &vcontext );
976 * FIXME: EXC_RtlRaiseException has unblocked all signals.
977 * If we receive nested SIGUSR2 here, VM86 event
978 * handling may lock up!
980 teb->vm86_ptr = vm86;
981 restore_vm86_context( &vcontext, vm86 );
984 else if(teb->dpmi_vif &&
985 !IS_SELECTOR_SYSTEM(context->SegCs) &&
986 !IS_SELECTOR_SYSTEM(context->SegSs))
988 /* Executing DPMI code and virtual interrupts are enabled. */
989 teb->vm86_pending = 0;
990 rec.ExceptionAddress = (LPVOID)context->Eip;
991 EXC_RtlRaiseException( &rec, context );
993 * EXC_RtlRaiseException has unblocked all signals and this
994 * signal handler is about to return to either DOS relay or
995 * IRQ handler. Because both of these will check pending
996 * interrupts again, it is not a problem if we receive
997 * a nested SIGUSR2 here and ignore it.
1003 /**********************************************************************
1006 * Handler for SIGUSR2.
1007 * We use it to signal that the running __wine_enter_vm86() should
1008 * immediately set VIP_MASK, causing pending events to be handled
1009 * as early as possible.
1011 static HANDLER_DEF(usr2_handler)
1015 save_context( &context, HANDLER_CONTEXT );
1016 set_vm86_pend( &context );
1017 restore_context( &context, HANDLER_CONTEXT );
1019 #endif /* __HAVE_VM86 */
1022 /**********************************************************************
1025 * Handler for SIGSEGV and related errors.
1027 static HANDLER_DEF(segv_handler)
1032 save_context( &context, HANDLER_CONTEXT );
1033 #ifdef FAULT_ADDRESS
1034 cr2 = FAULT_ADDRESS;
1038 do_segv( &context, get_trap_code(HANDLER_CONTEXT), cr2, get_error_code(HANDLER_CONTEXT) );
1039 restore_context( &context, HANDLER_CONTEXT );
1043 /**********************************************************************
1046 * Handler for SIGTRAP.
1048 static HANDLER_DEF(trap_handler)
1051 save_context( &context, HANDLER_CONTEXT );
1052 do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
1053 restore_context( &context, HANDLER_CONTEXT );
1057 /**********************************************************************
1060 * Handler for SIGFPE.
1062 static HANDLER_DEF(fpe_handler)
1065 save_fpu( &context, HANDLER_CONTEXT );
1066 save_context( &context, HANDLER_CONTEXT );
1067 do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
1068 restore_context( &context, HANDLER_CONTEXT );
1069 restore_fpu( &context, HANDLER_CONTEXT );
1073 /**********************************************************************
1076 * Handler for SIGINT.
1078 static HANDLER_DEF(int_handler)
1080 init_handler( HANDLER_CONTEXT );
1081 if (!dispatch_signal(SIGINT))
1083 EXCEPTION_RECORD rec;
1086 save_context( &context, HANDLER_CONTEXT );
1087 rec.ExceptionCode = CONTROL_C_EXIT;
1088 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1089 rec.ExceptionRecord = NULL;
1090 rec.ExceptionAddress = (LPVOID)context.Eip;
1091 rec.NumberParameters = 0;
1092 EXC_RtlRaiseException( &rec, &context );
1093 restore_context( &context, HANDLER_CONTEXT );
1097 /**********************************************************************
1100 * Handler for SIGABRT.
1102 static HANDLER_DEF(abrt_handler)
1104 EXCEPTION_RECORD rec;
1107 save_context( &context, HANDLER_CONTEXT );
1108 rec.ExceptionCode = EXCEPTION_WINE_ASSERTION;
1109 rec.ExceptionFlags = EH_NONCONTINUABLE;
1110 rec.ExceptionRecord = NULL;
1111 rec.ExceptionAddress = (LPVOID)context.Eip;
1112 rec.NumberParameters = 0;
1113 EXC_RtlRaiseException( &rec, &context ); /* Should never return.. */
1114 restore_context( &context, HANDLER_CONTEXT );
1118 /**********************************************************************
1121 * Handler for SIGTERM.
1123 static HANDLER_DEF(term_handler)
1125 init_handler( HANDLER_CONTEXT );
1126 SYSDEPS_AbortThread(0);
1130 /**********************************************************************
1133 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1135 static HANDLER_DEF(usr1_handler)
1137 LARGE_INTEGER timeout;
1139 init_handler( HANDLER_CONTEXT );
1140 /* wait with 0 timeout, will only return once the thread is no longer suspended */
1141 timeout.QuadPart = 0;
1142 NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout );
1146 /***********************************************************************
1149 * Set a signal handler
1151 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1153 struct sigaction sig_act;
1156 if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
1158 struct kernel_sigaction sig_act;
1159 sig_act.ksa_handler = func;
1160 sig_act.ksa_flags = SA_RESTART;
1161 sig_act.ksa_mask = (1 << (SIGINT-1)) |
1163 /* point to the top of the stack */
1164 sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
1165 return wine_sigaction( sig, &sig_act, NULL );
1168 sig_act.sa_handler = func;
1169 sigemptyset( &sig_act.sa_mask );
1170 sigaddset( &sig_act.sa_mask, SIGINT );
1171 sigaddset( &sig_act.sa_mask, SIGUSR2 );
1173 #if defined(linux) || defined(__NetBSD__)
1174 sig_act.sa_flags = SA_RESTART;
1175 #elif defined (__svr4__) || defined(_SCO_DS)
1176 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1178 sig_act.sa_flags = 0;
1182 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1184 return sigaction( sig, &sig_act, NULL );
1188 /***********************************************************************
1189 * __wine_set_signal_handler (NTDLL.@)
1191 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1193 if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1194 if (handlers[sig] != NULL) return -2;
1195 handlers[sig] = wsh;
1200 /**********************************************************************
1203 BOOL SIGNAL_Init(void)
1205 int have_sigaltstack = 0;
1207 #ifdef HAVE_SIGALTSTACK
1208 struct sigaltstack ss;
1209 if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1211 ss.ss_size = SIGNAL_STACK_SIZE;
1213 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1215 /* sigaltstack may fail because the kernel is too old, or
1216 because glibc is brain-dead. In the latter case a
1217 direct system call should succeed. */
1218 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1221 #endif /* HAVE_SIGALTSTACK */
1223 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1224 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1225 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1226 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1227 if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1228 if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1229 if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1231 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1234 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1238 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1244 perror("sigaction");
1249 /**********************************************************************
1252 * Block the async signals.
1254 void SIGNAL_Block(void)
1258 sigemptyset( &block_set );
1259 sigaddset( &block_set, SIGIO );
1260 sigaddset( &block_set, SIGHUP );
1261 sigaddset( &block_set, SIGUSR1 );
1262 sigaddset( &block_set, SIGUSR2 );
1263 sigprocmask( SIG_BLOCK, &block_set, NULL );
1267 /***********************************************************************
1270 * Unblock signals. Called from EXC_RtlRaiseException.
1272 void SIGNAL_Unblock(void)
1276 sigfillset( &all_sigs );
1277 sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
1281 /**********************************************************************
1284 * Restore the default handlers.
1286 void SIGNAL_Reset(void)
1288 signal( SIGINT, SIG_DFL );
1289 signal( SIGFPE, SIG_DFL );
1290 signal( SIGSEGV, SIG_DFL );
1291 signal( SIGILL, SIG_DFL );
1292 signal( SIGABRT, SIG_DFL );
1293 signal( SIGTERM, SIG_DFL );
1295 signal( SIGBUS, SIG_DFL );
1298 signal( SIGTRAP, SIG_DFL );
1304 /**********************************************************************
1305 * __wine_enter_vm86 (NTDLL.@)
1307 * Enter vm86 mode with the specified register context.
1309 void __wine_enter_vm86( CONTEXT *context )
1311 EXCEPTION_RECORD rec;
1312 TEB *teb = NtCurrentTeb();
1314 struct vm86plus_struct vm86;
1316 memset( &vm86, 0, sizeof(vm86) );
1319 restore_vm86_context( context, &vm86 );
1320 /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1321 * so save it on entry, just in case */
1322 teb->vm86_pending |= (context->EFlags & VIP_MASK);
1323 /* Work around race conditions with signal handler
1324 * (avoiding sigprocmask for performance reasons) */
1325 teb->vm86_ptr = &vm86;
1326 vm86.regs.eflags |= teb->vm86_pending;
1327 /* Check for VIF|VIP here, since vm86_enter doesn't */
1328 if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1329 teb->vm86_ptr = NULL;
1330 teb->vm86_pending = 0;
1331 context->EFlags |= VIP_MASK;
1332 rec.ExceptionCode = EXCEPTION_VM86_STI;
1333 rec.ExceptionInformation[0] = 0;
1339 res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1345 } while (VM86_TYPE(res) == VM86_SIGNAL);
1347 save_vm86_context( context, &vm86 );
1348 context->EFlags |= teb->vm86_pending;
1350 switch(VM86_TYPE(res))
1352 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1353 do_segv( context, T_PROTFLT, 0, 0 );
1355 case VM86_TRAP: /* return due to DOS-debugger request */
1356 do_trap( context, VM86_ARG(res) );
1358 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1359 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1361 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1362 teb->vm86_pending = 0;
1363 rec.ExceptionCode = EXCEPTION_VM86_STI;
1365 case VM86_PICRETURN: /* return due to pending PIC request */
1366 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1369 ERR( "unhandled result from vm86 mode %x\n", res );
1372 rec.ExceptionInformation[0] = VM86_ARG(res);
1374 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1375 rec.ExceptionRecord = NULL;
1376 rec.ExceptionAddress = (LPVOID)context->Eip;
1377 rec.NumberParameters = 1;
1378 EXC_RtlRaiseException( &rec, context );
1382 #else /* __HAVE_VM86 */
1383 /**********************************************************************
1384 * __wine_enter_vm86 (NTDLL.@)
1386 void __wine_enter_vm86( CONTEXT *context )
1388 MESSAGE("vm86 mode not supported on this platform\n");
1390 #endif /* __HAVE_VM86 */
1392 /**********************************************************************
1393 * DbgBreakPoint (NTDLL.@)
1395 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1397 /**********************************************************************
1398 * DbgUserBreakPoint (NTDLL.@)
1400 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1402 #endif /* __i386__ */