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"
410 #include "wine/debug.h"
412 WINE_DEFAULT_DEBUG_CHANNEL(seh);
414 typedef int (*wine_signal_handler)(unsigned int sig);
416 static wine_signal_handler handlers[256];
418 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
419 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context );
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);
460 /***********************************************************************
463 * Get the base of the signal stack for the current thread.
465 static inline void *get_signal_stack(void)
467 return (char *)NtCurrentTeb() + 4096;
471 /***********************************************************************
474 * Get the current teb based on the stack pointer.
476 static inline TEB *get_current_teb(void)
479 __asm__("movl %%esp,%0" : "=g" (esp) );
480 return (TEB *)((esp & ~4095) - 4096);
485 /***********************************************************************
488 * Set the register values from a vm86 structure.
490 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
492 context->Eax = vm86->regs.eax;
493 context->Ebx = vm86->regs.ebx;
494 context->Ecx = vm86->regs.ecx;
495 context->Edx = vm86->regs.edx;
496 context->Esi = vm86->regs.esi;
497 context->Edi = vm86->regs.edi;
498 context->Esp = vm86->regs.esp;
499 context->Ebp = vm86->regs.ebp;
500 context->Eip = vm86->regs.eip;
501 context->SegCs = vm86->regs.cs;
502 context->SegDs = vm86->regs.ds;
503 context->SegEs = vm86->regs.es;
504 context->SegFs = vm86->regs.fs;
505 context->SegGs = vm86->regs.gs;
506 context->SegSs = vm86->regs.ss;
507 context->EFlags = vm86->regs.eflags;
511 /***********************************************************************
512 * restore_vm86_context
514 * Build a vm86 structure from the register values.
516 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
518 vm86->regs.eax = context->Eax;
519 vm86->regs.ebx = context->Ebx;
520 vm86->regs.ecx = context->Ecx;
521 vm86->regs.edx = context->Edx;
522 vm86->regs.esi = context->Esi;
523 vm86->regs.edi = context->Edi;
524 vm86->regs.esp = context->Esp;
525 vm86->regs.ebp = context->Ebp;
526 vm86->regs.eip = context->Eip;
527 vm86->regs.cs = context->SegCs;
528 vm86->regs.ds = context->SegDs;
529 vm86->regs.es = context->SegEs;
530 vm86->regs.fs = context->SegFs;
531 vm86->regs.gs = context->SegGs;
532 vm86->regs.ss = context->SegSs;
533 vm86->regs.eflags = context->EFlags;
537 /**********************************************************************
538 * merge_vm86_pending_flags
540 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
541 * raises exception if there are pending events and VIF flag
542 * has been turned on.
544 * Called from __wine_enter_vm86 because vm86_enter
545 * doesn't check for pending events.
547 * Called from raise_vm86_sti_exception to check for
548 * pending events in a signal safe way.
550 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
552 BOOL check_pending = TRUE;
553 struct vm86plus_struct *vm86 =
554 (struct vm86plus_struct*)(NtCurrentTeb()->vm86_ptr);
557 * In order to prevent a race when SIGUSR2 occurs while
558 * we are returning from exception handler, pending events
559 * will be rechecked after each raised exception.
561 while (check_pending && NtCurrentTeb()->vm86_pending)
563 check_pending = FALSE;
564 NtCurrentTeb()->vm86_ptr = NULL;
567 * If VIF is set, throw exception.
568 * Note that SIGUSR2 may turn VIF flag off so
569 * VIF check must occur only when TEB.vm86_ptr is NULL.
571 if (vm86->regs.eflags & VIF_MASK)
574 save_vm86_context( &vcontext, vm86 );
576 rec->ExceptionCode = EXCEPTION_VM86_STI;
577 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
578 rec->ExceptionRecord = NULL;
579 rec->NumberParameters = 0;
580 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
582 vcontext.EFlags &= ~VIP_MASK;
583 NtCurrentTeb()->vm86_pending = 0;
584 EXC_RtlRaiseException( rec, &vcontext );
586 restore_vm86_context( &vcontext, vm86 );
587 check_pending = TRUE;
590 NtCurrentTeb()->vm86_ptr = vm86;
594 * Merge VIP flags in a signal safe way. This requires
595 * that the following operation compiles into atomic
598 vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
600 #endif /* __HAVE_VM86 */
603 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
606 /***********************************************************************
609 * Handler initialization when the full context is not needed.
611 static void *init_handler( const SIGCONTEXT *sigcontext )
613 void *stack = (void *)ESP_sig(sigcontext);
614 TEB *teb = get_current_teb();
616 wine_set_fs( teb->teb_sel );
618 /* now restore a proper %gs for the fault handler */
619 if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
620 !IS_SELECTOR_SYSTEM(SS_sig(sigcontext))) /* 16-bit mode */
623 * Win16 or DOS protected mode. Note that during switch
624 * from 16-bit mode to linear mode, CS may be set to system
625 * segment before FS is restored. Fortunately, in this case
626 * SS is still non-system segment. This is why both CS and SS
629 wine_set_gs( teb->gs_sel );
630 stack = (void *)teb->cur_stack;
633 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
635 unsigned int *int_stack = stack;
636 /* fetch the saved %gs from the stack */
637 wine_set_gs( int_stack[0] );
640 else /* 32-bit mode */
643 wine_set_gs( GS_sig(sigcontext) );
650 /***********************************************************************
653 * Set the FPU context from a sigcontext.
655 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
658 if (FPU_sig(sigcontext))
660 context->FloatSave = *FPU_sig(sigcontext);
665 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
666 #endif /* __GNUC__ */
670 /***********************************************************************
673 * Restore the FPU context to a sigcontext.
675 inline static void restore_fpu( CONTEXT *context )
677 /* reset the current interrupt status */
678 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
680 /* avoid nested exceptions */
681 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
682 #endif /* __GNUC__ */
686 /***********************************************************************
689 * Setup a proper stack frame for the raise function, and modify the
690 * sigcontext so that the return from the signal handler will call
691 * the raise function.
693 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
697 void *ret_addr; /* return address from raise_func */
698 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
699 CONTEXT *context_ptr; /* second arg for raise_func */
700 void *dummy; /* dummy ret addr for __wine_call_from_32_restore_regs */
702 EXCEPTION_RECORD rec;
709 /* get %fs and %gs at time of the fault */
711 fs = LOWORD(FS_sig(sigcontext));
716 gs = LOWORD(GS_sig(sigcontext));
721 stack = init_handler( sigcontext );
723 /* stack sanity checks */
725 if ((char *)stack >= (char *)get_signal_stack() &&
726 (char *)stack < (char *)get_signal_stack() + SIGNAL_STACK_SIZE)
728 ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
729 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
730 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
731 server_abort_thread(1);
734 if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
735 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
737 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack;
740 ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
741 diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
742 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
743 server_abort_thread(1);
745 else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
746 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
747 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
750 stack--; /* push the stack_layout structure */
751 stack->ret_addr = __wine_call_from_32_restore_regs;
752 stack->rec_ptr = &stack->rec;
753 stack->context_ptr = &stack->context;
755 stack->rec.ExceptionRecord = NULL;
756 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
757 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
758 stack->rec.NumberParameters = 0;
760 stack->context.ContextFlags = CONTEXT_FULL;
761 stack->context.Eax = EAX_sig(sigcontext);
762 stack->context.Ebx = EBX_sig(sigcontext);
763 stack->context.Ecx = ECX_sig(sigcontext);
764 stack->context.Edx = EDX_sig(sigcontext);
765 stack->context.Esi = ESI_sig(sigcontext);
766 stack->context.Edi = EDI_sig(sigcontext);
767 stack->context.Ebp = EBP_sig(sigcontext);
768 stack->context.EFlags = EFL_sig(sigcontext);
769 stack->context.Eip = EIP_sig(sigcontext);
770 stack->context.Esp = ESP_sig(sigcontext);
771 stack->context.SegCs = LOWORD(CS_sig(sigcontext));
772 stack->context.SegDs = LOWORD(DS_sig(sigcontext));
773 stack->context.SegEs = LOWORD(ES_sig(sigcontext));
774 stack->context.SegFs = fs;
775 stack->context.SegGs = gs;
776 stack->context.SegSs = LOWORD(SS_sig(sigcontext));
778 /* now modify the sigcontext to return to the raise function */
779 ESP_sig(sigcontext) = (DWORD)stack;
780 EIP_sig(sigcontext) = (DWORD)func;
781 CS_sig(sigcontext) = wine_get_cs();
782 DS_sig(sigcontext) = wine_get_ds();
783 ES_sig(sigcontext) = wine_get_es();
784 FS_sig(sigcontext) = wine_get_fs();
785 GS_sig(sigcontext) = wine_get_gs();
786 SS_sig(sigcontext) = wine_get_ss();
788 return stack->rec_ptr;
792 /***********************************************************************
793 * get_exception_context
795 * Get a pointer to the context built by setup_exception.
797 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
799 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
803 /**********************************************************************
806 * Get the FPU exception code from the FPU status.
808 static inline DWORD get_fpu_code( const CONTEXT *context )
810 DWORD status = context->FloatSave.StatusWord;
812 if (status & 0x01) /* IE */
814 if (status & 0x40) /* SF */
815 return EXCEPTION_FLT_STACK_CHECK;
817 return EXCEPTION_FLT_INVALID_OPERATION;
819 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
820 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
821 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
822 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
823 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
824 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
828 /**********************************************************************
829 * raise_segv_exception
831 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
833 switch(rec->ExceptionCode)
835 case EXCEPTION_ACCESS_VIOLATION:
836 if (rec->NumberParameters == 2)
838 if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] )))
842 case EXCEPTION_DATATYPE_MISALIGNMENT:
843 /* FIXME: pass through exception handler first? */
844 if (context->EFlags & 0x00040000)
846 /* Disable AC flag, return */
847 context->EFlags &= ~0x00040000;
852 EXC_RtlRaiseException( rec, context );
856 /**********************************************************************
857 * raise_trap_exception
859 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
861 DWORD dr0, dr1, dr2, dr3, dr6, dr7;
863 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
865 if (context->EFlags & 0x100)
867 context->EFlags &= ~0x100; /* clear single-step flag */
869 else /* hardware breakpoint, fetch the debug registers */
871 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
872 NtGetContextThread(GetCurrentThread(), context);
873 /* do we really have a bp from a debug register ?
874 * if not, then someone did a kill(SIGTRAP) on us, and we
875 * shall return a breakpoint, not a single step exception
877 if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
888 EXC_RtlRaiseException( rec, context );
890 if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
891 dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
893 /* the debug registers have changed, set the new values */
894 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
895 NtSetContextThread(GetCurrentThread(), context);
900 /**********************************************************************
901 * raise_fpu_exception
903 static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
905 EXC_RtlRaiseException( rec, context );
906 restore_fpu( context );
911 /**********************************************************************
912 * raise_vm86_sti_exception
914 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
916 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
917 NtCurrentTeb()->vm86_pending |= VIP_MASK;
919 if (NtCurrentTeb()->vm86_ptr)
921 if (((char*)context->Eip >= (char*)vm86_return) &&
922 ((char*)context->Eip <= (char*)vm86_return_end) &&
923 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
924 /* exiting from VM86, can't throw */
927 merge_vm86_pending_flags( rec );
929 else if (NtCurrentTeb()->dpmi_vif &&
930 !IS_SELECTOR_SYSTEM(context->SegCs) &&
931 !IS_SELECTOR_SYSTEM(context->SegSs))
933 /* Executing DPMI code and virtual interrupts are enabled. */
934 NtCurrentTeb()->vm86_pending = 0;
935 EXC_RtlRaiseException( rec, context );
940 /**********************************************************************
943 * Handler for SIGUSR2.
944 * We use it to signal that the running __wine_enter_vm86() should
945 * immediately set VIP_MASK, causing pending events to be handled
946 * as early as possible.
948 static HANDLER_DEF(usr2_handler)
950 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
951 rec->ExceptionCode = EXCEPTION_VM86_STI;
953 #endif /* __HAVE_VM86 */
956 /**********************************************************************
959 * Handler for SIGSEGV and related errors.
961 static HANDLER_DEF(segv_handler)
963 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
965 switch(get_trap_code(HANDLER_CONTEXT))
967 case T_OFLOW: /* Overflow exception */
968 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
970 case T_BOUND: /* Bound range exception */
971 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
973 case T_PRIVINFLT: /* Invalid opcode exception */
974 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
976 case T_STKFLT: /* Stack fault */
977 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
979 case T_SEGNPFLT: /* Segment not present exception */
980 case T_PROTFLT: /* General protection fault */
981 case T_UNKNOWN: /* Unknown fault code */
982 rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
983 : EXCEPTION_PRIV_INSTRUCTION;
985 case T_PAGEFLT: /* Page fault */
986 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
988 rec->NumberParameters = 2;
989 rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
990 rec->ExceptionInformation[1] = (DWORD)FAULT_ADDRESS;
993 case T_ALIGNFLT: /* Alignment check exception */
994 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
997 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
999 case T_NMI: /* NMI interrupt */
1000 case T_DNA: /* Device not available exception */
1001 case T_DOUBLEFLT: /* Double fault exception */
1002 case T_TSSFLT: /* Invalid TSS exception */
1003 case T_RESERVED: /* Unknown exception */
1004 case T_MCHK: /* Machine check exception */
1006 case T_CACHEFLT: /* Cache flush exception */
1008 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1014 /**********************************************************************
1017 * Handler for SIGTRAP.
1019 static HANDLER_DEF(trap_handler)
1021 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
1023 switch(get_trap_code(HANDLER_CONTEXT))
1025 case T_TRCTRAP: /* Single-step exception */
1026 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1027 EFL_sig(HANDLER_CONTEXT) &= ~0x100; /* clear single-step flag */
1029 case T_BPTFLT: /* Breakpoint exception */
1030 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1033 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1039 /**********************************************************************
1042 * Handler for SIGFPE.
1044 static HANDLER_DEF(fpe_handler)
1046 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception );
1049 context = get_exception_context( rec );
1050 save_fpu( context, HANDLER_CONTEXT );
1052 switch(get_trap_code(HANDLER_CONTEXT))
1054 case T_DIVIDE: /* Division by zero exception */
1055 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1057 case T_FPOPFLT: /* Coprocessor segment overrun */
1058 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1060 case T_ARITHTRAP: /* Floating point exception */
1061 case T_UNKNOWN: /* Unknown fault code */
1062 rec->ExceptionCode = get_fpu_code( context );
1065 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1066 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1072 /**********************************************************************
1075 * Handler for SIGINT.
1077 static HANDLER_DEF(int_handler)
1079 init_handler( HANDLER_CONTEXT );
1080 if (!dispatch_signal(SIGINT))
1082 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
1083 rec->ExceptionCode = CONTROL_C_EXIT;
1087 /**********************************************************************
1090 * Handler for SIGABRT.
1092 static HANDLER_DEF(abrt_handler)
1094 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
1095 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1096 rec->ExceptionFlags = EH_NONCONTINUABLE;
1100 /**********************************************************************
1103 * Handler for SIGTERM.
1105 static HANDLER_DEF(term_handler)
1107 init_handler( HANDLER_CONTEXT );
1108 server_abort_thread(0);
1112 /**********************************************************************
1115 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1117 static HANDLER_DEF(usr1_handler)
1119 LARGE_INTEGER timeout;
1121 init_handler( HANDLER_CONTEXT );
1122 /* wait with 0 timeout, will only return once the thread is no longer suspended */
1123 timeout.QuadPart = 0;
1124 NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout );
1128 /***********************************************************************
1131 * Set a signal handler
1133 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1135 struct sigaction sig_act;
1138 if (!have_sigaltstack)
1140 struct kernel_sigaction sig_act;
1141 sig_act.ksa_handler = func;
1142 sig_act.ksa_flags = SA_RESTART;
1143 sig_act.ksa_mask = (1 << (SIGINT-1)) |
1145 /* point to the top of the signal stack */
1146 sig_act.ksa_restorer = (char *)get_signal_stack() + SIGNAL_STACK_SIZE;
1147 return wine_sigaction( sig, &sig_act, NULL );
1150 sig_act.sa_handler = func;
1151 sigemptyset( &sig_act.sa_mask );
1152 sigaddset( &sig_act.sa_mask, SIGINT );
1153 sigaddset( &sig_act.sa_mask, SIGUSR2 );
1155 #if defined(linux) || defined(__NetBSD__)
1156 sig_act.sa_flags = SA_RESTART;
1157 #elif defined (__svr4__) || defined(_SCO_DS)
1158 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1160 sig_act.sa_flags = 0;
1164 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1166 return sigaction( sig, &sig_act, NULL );
1170 /***********************************************************************
1171 * __wine_set_signal_handler (NTDLL.@)
1173 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1175 if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1176 if (handlers[sig] != NULL) return -2;
1177 handlers[sig] = wsh;
1182 /**********************************************************************
1185 BOOL SIGNAL_Init(void)
1187 int have_sigaltstack = 0;
1189 #ifdef HAVE_SIGALTSTACK
1190 struct sigaltstack ss;
1191 ss.ss_sp = get_signal_stack();
1192 ss.ss_size = SIGNAL_STACK_SIZE;
1194 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1196 /* sigaltstack may fail because the kernel is too old, or
1197 because glibc is brain-dead. In the latter case a
1198 direct system call should succeed. */
1199 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1201 #endif /* HAVE_SIGALTSTACK */
1203 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1204 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1205 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1206 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1207 if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1208 if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1209 if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1211 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1214 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1218 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1224 perror("sigaction");
1230 /**********************************************************************
1231 * __wine_enter_vm86 (NTDLL.@)
1233 * Enter vm86 mode with the specified register context.
1235 void __wine_enter_vm86( CONTEXT *context )
1237 EXCEPTION_RECORD rec;
1238 TEB *teb = NtCurrentTeb();
1240 struct vm86plus_struct vm86;
1242 memset( &vm86, 0, sizeof(vm86) );
1245 restore_vm86_context( context, &vm86 );
1247 teb->vm86_ptr = &vm86;
1248 merge_vm86_pending_flags( &rec );
1250 res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1257 save_vm86_context( context, &vm86 );
1259 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1260 rec.ExceptionRecord = NULL;
1261 rec.ExceptionAddress = (LPVOID)context->Eip;
1262 rec.NumberParameters = 0;
1264 switch(VM86_TYPE(res))
1266 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1267 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1268 raise_segv_exception( &rec, context );
1270 case VM86_TRAP: /* return due to DOS-debugger request */
1271 switch(VM86_ARG(res))
1273 case T_TRCTRAP: /* Single-step exception */
1274 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1275 context->EFlags &= ~0x100; /* clear single-step flag */
1277 case T_BPTFLT: /* Breakpoint exception */
1278 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1281 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1284 raise_trap_exception( &rec, context );
1286 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1287 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1288 rec.NumberParameters = 1;
1289 rec.ExceptionInformation[0] = VM86_ARG(res);
1291 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1292 context->EFlags |= VIF_MASK;
1293 context->EFlags &= ~VIP_MASK;
1294 teb->vm86_pending = 0;
1295 rec.ExceptionCode = EXCEPTION_VM86_STI;
1297 case VM86_PICRETURN: /* return due to pending PIC request */
1298 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1300 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1302 ERR( "unhandled result from vm86 mode %x\n", res );
1305 EXC_RtlRaiseException( &rec, context );
1309 #else /* __HAVE_VM86 */
1310 /**********************************************************************
1311 * __wine_enter_vm86 (NTDLL.@)
1313 void __wine_enter_vm86( CONTEXT *context )
1315 MESSAGE("vm86 mode not supported on this platform\n");
1317 #endif /* __HAVE_VM86 */
1319 /**********************************************************************
1320 * DbgBreakPoint (NTDLL.@)
1322 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1324 /**********************************************************************
1325 * DbgUserBreakPoint (NTDLL.@)
1327 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1329 #endif /* __i386__ */