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"
61 /***********************************************************************
62 * signal context platform-specific definitions
68 unsigned short sc_gs, __gsh;
69 unsigned short sc_fs, __fsh;
70 unsigned short sc_es, __esh;
71 unsigned short sc_ds, __dsh;
80 unsigned long sc_trapno;
83 unsigned short sc_cs, __csh;
84 unsigned long sc_eflags;
85 unsigned long esp_at_signal;
86 unsigned short sc_ss, __ssh;
88 unsigned long oldmask;
92 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
93 #define HANDLER_CONTEXT (&__context)
95 /* this is the sigaction structure from the Linux 2.1.20 kernel. */
96 struct kernel_sigaction
98 void (*ksa_handler)();
99 unsigned long ksa_mask;
100 unsigned long ksa_flags;
104 /* Similar to the sigaction function in libc, except it leaves alone the
105 restorer field, which is used to specify the signal stack address */
106 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
107 struct kernel_sigaction *old )
109 __asm__ __volatile__( "pushl %%ebx\n\t"
114 : "0" (SYS_sigaction), "S" (sig), "c" (new), "d" (old) );
115 if (sig>=0) return 0;
120 #ifdef HAVE_SIGALTSTACK
121 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
122 static inline int wine_sigaltstack( const struct sigaltstack *new,
123 struct sigaltstack *old )
126 __asm__ __volatile__( "pushl %%ebx\n\t"
131 : "0" (SYS_sigaltstack), "q" (new), "c" (old) );
132 if (ret >= 0) return 0;
138 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
140 int vm86_enter( void **vm86_ptr );
141 void vm86_return(void);
142 void vm86_return_end(void);
143 __ASM_GLOBAL_FUNC(vm86_enter,
145 "movl %esp, %ebp\n\t"
146 "movl $166,%eax\n\t" /*SYS_vm86*/
147 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
148 "movl (%ecx),%ecx\n\t"
150 "movl $1,%ebx\n\t" /*VM86_ENTER*/
151 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
155 ".globl " __ASM_NAME("vm86_return") "\n\t"
156 __ASM_FUNC("vm86_return") "\n"
157 __ASM_NAME("vm86_return") ":\n\t"
163 "testl %eax,%eax\n\t"
165 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
166 "je " __ASM_NAME("vm86_enter") "\n\t"
168 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
170 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
171 __ASM_FUNC("vm86_return_end") "\n"
172 __ASM_NAME("vm86_return_end") ":\n\t"
175 #ifdef HAVE_SYS_VM86_H
183 #define EAX_sig(context) ((context)->tf_eax)
184 #define EBX_sig(context) ((context)->tf_ebx)
185 #define ECX_sig(context) ((context)->tf_ecx)
186 #define EDX_sig(context) ((context)->tf_edx)
187 #define ESI_sig(context) ((context)->tf_esi)
188 #define EDI_sig(context) ((context)->tf_edi)
189 #define EBP_sig(context) ((context)->tf_ebp)
191 #define CS_sig(context) ((context)->tf_cs)
192 #define DS_sig(context) ((context)->tf_ds)
193 #define ES_sig(context) ((context)->tf_es)
194 #define SS_sig(context) ((context)->tf_ss)
196 #include <machine/frame.h>
197 typedef struct trapframe SIGCONTEXT;
199 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
200 #define HANDLER_CONTEXT __context
202 #define EFL_sig(context) ((context)->tf_eflags)
204 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
205 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
209 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
211 typedef struct sigcontext SIGCONTEXT;
213 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
214 #define HANDLER_CONTEXT __context
218 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
221 #include <sys/regset.h>
225 #include <sys/ucontext.h>
227 typedef struct ucontext SIGCONTEXT;
229 #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
230 #define HANDLER_CONTEXT __context
232 #endif /* svr4 || SCO_DS */
238 unsigned long ContextFlags;
239 FLOATING_SAVE_AREA sc_float;
244 unsigned long sc_edi;
245 unsigned long sc_esi;
246 unsigned long sc_eax;
247 unsigned long sc_ebx;
248 unsigned long sc_ecx;
249 unsigned long sc_edx;
250 unsigned long sc_ebp;
251 unsigned long sc_eip;
253 unsigned long sc_eflags;
254 unsigned long sc_esp;
262 /* FIXME: This section is just here so it can compile, it's most likely
263 * completely wrong. */
267 unsigned short sc_gs, __gsh;
268 unsigned short sc_fs, __fsh;
269 unsigned short sc_es, __esh;
270 unsigned short sc_ds, __dsh;
271 unsigned long sc_edi;
272 unsigned long sc_esi;
273 unsigned long sc_ebp;
274 unsigned long sc_esp;
275 unsigned long sc_ebx;
276 unsigned long sc_edx;
277 unsigned long sc_ecx;
278 unsigned long sc_eax;
279 unsigned long sc_trapno;
280 unsigned long sc_err;
281 unsigned long sc_eip;
282 unsigned short sc_cs, __csh;
283 unsigned long sc_eflags;
284 unsigned long esp_at_signal;
285 unsigned short sc_ss, __ssh;
287 unsigned long oldmask;
291 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
292 #define HANDLER_CONTEXT (&__context)
294 #endif /* __CYGWIN__ */
297 # include <sys/ucontext.h>
298 # include <sys/types.h>
301 typedef siginfo_t siginfo;
302 typedef struct ucontext SIGCONTEXT;
304 # define HANDLER_DEF(name) void name( int __signal, siginfo *__siginfo, SIGCONTEXT *__context )
305 # define HANDLER_CONTEXT (__context)
307 #endif /* __APPLE__ */
309 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
310 defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
312 #define EAX_sig(context) ((context)->sc_eax)
313 #define EBX_sig(context) ((context)->sc_ebx)
314 #define ECX_sig(context) ((context)->sc_ecx)
315 #define EDX_sig(context) ((context)->sc_edx)
316 #define ESI_sig(context) ((context)->sc_esi)
317 #define EDI_sig(context) ((context)->sc_edi)
318 #define EBP_sig(context) ((context)->sc_ebp)
320 #define CS_sig(context) ((context)->sc_cs)
321 #define DS_sig(context) ((context)->sc_ds)
322 #define ES_sig(context) ((context)->sc_es)
323 #define FS_sig(context) ((context)->sc_fs)
324 #define GS_sig(context) ((context)->sc_gs)
325 #define SS_sig(context) ((context)->sc_ss)
327 #define TRAP_sig(context) ((context)->sc_trapno)
330 #define ERROR_sig(context) ((context)->sc_err)
334 #define ERROR_sig(context) ((context)->sc_err)
335 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
336 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
340 #define EFL_sig(context) ((context)->sc_efl)
341 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
342 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
344 #define EFL_sig(context) ((context)->sc_eflags)
347 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
348 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
350 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
352 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
358 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
359 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
360 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
361 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
362 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
363 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
364 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
366 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
367 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
368 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
369 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
371 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
372 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
374 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
376 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
378 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
380 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
382 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
385 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
388 #define FAULT_ADDRESS (__siginfo->si_addr)
390 #endif /* svr4 || SCO_DS */
393 #define EAX_sig(context) ((context)->uc_mcontext.sc_eax)
394 #define EBX_sig(context) ((context)->uc_mcontext.sc_ebx)
395 #define ECX_sig(context) ((context)->uc_mcontext.sc_ecx)
396 #define EDX_sig(context) ((context)->uc_mcontext.sc_edx)
397 #define ESI_sig(context) ((context)->uc_mcontext.sc_esi)
398 #define EDI_sig(context) ((context)->uc_mcontext.sc_edi)
399 #define EBP_sig(context) ((context)->uc_mcontext.sc_ebp)
401 #define CS_sig(context) ((context)->uc_mcontext.sc_cs)
402 #define DS_sig(context) ((context)->uc_mcontext.sc_ds)
403 #define ES_sig(context) ((context)->uc_mcontext.sc_es)
404 #define FS_sig(context) ((context)->uc_mcontext.sc_fs)
405 #define GS_sig(context) ((context)->uc_mcontext.sc_gs)
406 #define SS_sig(context) ((context)->uc_mcontext.sc_ss)
408 #define EFL_sig(context) ((context)->uc_mcontext.sc_eflags)
410 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.sc_eip))
411 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.sc_esp))
413 #endif /* __APPLE__ */
415 /* exception code definitions (already defined by FreeBSD/NetBSD) */
416 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
417 #define T_DIVIDE 0 /* Division by zero exception */
418 #define T_TRCTRAP 1 /* Single-step exception */
419 #define T_NMI 2 /* NMI interrupt */
420 #define T_BPTFLT 3 /* Breakpoint exception */
421 #define T_OFLOW 4 /* Overflow exception */
422 #define T_BOUND 5 /* Bound range exception */
423 #define T_PRIVINFLT 6 /* Invalid opcode exception */
424 #define T_DNA 7 /* Device not available exception */
425 #define T_DOUBLEFLT 8 /* Double fault exception */
426 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
427 #define T_TSSFLT 10 /* Invalid TSS exception */
428 #define T_SEGNPFLT 11 /* Segment not present exception */
429 #define T_STKFLT 12 /* Stack fault */
430 #define T_PROTFLT 13 /* General protection fault */
431 #define T_PAGEFLT 14 /* Page fault */
432 #define T_RESERVED 15 /* Unknown exception */
433 #define T_ARITHTRAP 16 /* Floating point exception */
434 #define T_ALIGNFLT 17 /* Alignment check exception */
435 #define T_MCHK 18 /* Machine check exception */
436 #define T_CACHEFLT 19 /* Cache flush exception */
438 #if defined(__NetBSD__)
439 #define T_MCHK 19 /* Machine check exception */
442 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
444 #include "wine/exception.h"
445 #include "wine/debug.h"
447 WINE_DEFAULT_DEBUG_CHANNEL(seh);
449 typedef int (*wine_signal_handler)(unsigned int sig);
451 static wine_signal_handler handlers[256];
453 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context );
456 /***********************************************************************
459 inline static int dispatch_signal(unsigned int sig)
461 if (handlers[sig] == NULL) return 0;
462 return handlers[sig](sig);
466 /***********************************************************************
469 * Get the trap code for a signal.
471 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
474 return TRAP_sig(sigcontext);
476 return T_UNKNOWN; /* unknown trap code */
480 /***********************************************************************
483 * Get the error code for a signal.
485 static inline int get_error_code( const SIGCONTEXT *sigcontext )
488 return ERROR_sig(sigcontext);
494 /***********************************************************************
497 * Get the base of the signal stack for the current thread.
499 static inline void *get_signal_stack(void)
501 return (char *)NtCurrentTeb() + 4096;
505 /***********************************************************************
508 * Get the current teb based on the stack pointer.
510 static inline TEB *get_current_teb(void)
513 __asm__("movl %%esp,%0" : "=g" (esp) );
514 return (TEB *)((esp & ~4095) - 4096);
519 /***********************************************************************
522 * Set the register values from a vm86 structure.
524 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
526 context->Eax = vm86->regs.eax;
527 context->Ebx = vm86->regs.ebx;
528 context->Ecx = vm86->regs.ecx;
529 context->Edx = vm86->regs.edx;
530 context->Esi = vm86->regs.esi;
531 context->Edi = vm86->regs.edi;
532 context->Esp = vm86->regs.esp;
533 context->Ebp = vm86->regs.ebp;
534 context->Eip = vm86->regs.eip;
535 context->SegCs = vm86->regs.cs;
536 context->SegDs = vm86->regs.ds;
537 context->SegEs = vm86->regs.es;
538 context->SegFs = vm86->regs.fs;
539 context->SegGs = vm86->regs.gs;
540 context->SegSs = vm86->regs.ss;
541 context->EFlags = vm86->regs.eflags;
545 /***********************************************************************
546 * restore_vm86_context
548 * Build a vm86 structure from the register values.
550 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
552 vm86->regs.eax = context->Eax;
553 vm86->regs.ebx = context->Ebx;
554 vm86->regs.ecx = context->Ecx;
555 vm86->regs.edx = context->Edx;
556 vm86->regs.esi = context->Esi;
557 vm86->regs.edi = context->Edi;
558 vm86->regs.esp = context->Esp;
559 vm86->regs.ebp = context->Ebp;
560 vm86->regs.eip = context->Eip;
561 vm86->regs.cs = context->SegCs;
562 vm86->regs.ds = context->SegDs;
563 vm86->regs.es = context->SegEs;
564 vm86->regs.fs = context->SegFs;
565 vm86->regs.gs = context->SegGs;
566 vm86->regs.ss = context->SegSs;
567 vm86->regs.eflags = context->EFlags;
571 /**********************************************************************
572 * merge_vm86_pending_flags
574 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
575 * raises exception if there are pending events and VIF flag
576 * has been turned on.
578 * Called from __wine_enter_vm86 because vm86_enter
579 * doesn't check for pending events.
581 * Called from raise_vm86_sti_exception to check for
582 * pending events in a signal safe way.
584 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
586 BOOL check_pending = TRUE;
587 struct vm86plus_struct *vm86 =
588 (struct vm86plus_struct*)(NtCurrentTeb()->vm86_ptr);
591 * In order to prevent a race when SIGUSR2 occurs while
592 * we are returning from exception handler, pending events
593 * will be rechecked after each raised exception.
595 while (check_pending && NtCurrentTeb()->vm86_pending)
597 check_pending = FALSE;
598 NtCurrentTeb()->vm86_ptr = NULL;
601 * If VIF is set, throw exception.
602 * Note that SIGUSR2 may turn VIF flag off so
603 * VIF check must occur only when TEB.vm86_ptr is NULL.
605 if (vm86->regs.eflags & VIF_MASK)
608 save_vm86_context( &vcontext, vm86 );
610 rec->ExceptionCode = EXCEPTION_VM86_STI;
611 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
612 rec->ExceptionRecord = NULL;
613 rec->NumberParameters = 0;
614 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
616 vcontext.EFlags &= ~VIP_MASK;
617 NtCurrentTeb()->vm86_pending = 0;
618 __regs_RtlRaiseException( rec, &vcontext );
620 restore_vm86_context( &vcontext, vm86 );
621 check_pending = TRUE;
624 NtCurrentTeb()->vm86_ptr = vm86;
628 * Merge VIP flags in a signal safe way. This requires
629 * that the following operation compiles into atomic
632 vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
634 #endif /* __HAVE_VM86 */
637 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
640 /***********************************************************************
643 * Handler initialization when the full context is not needed.
645 static void *init_handler( const SIGCONTEXT *sigcontext )
647 void *stack = (void *)ESP_sig(sigcontext);
648 TEB *teb = get_current_teb();
650 wine_set_fs( teb->teb_sel );
652 /* now restore a proper %gs for the fault handler */
653 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
654 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
657 * Win16 or DOS protected mode. Note that during switch
658 * from 16-bit mode to linear mode, CS may be set to system
659 * segment before FS is restored. Fortunately, in this case
660 * SS is still non-system segment. This is why both CS and SS
663 wine_set_gs( teb->gs_sel );
664 stack = (void *)teb->cur_stack;
667 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
669 unsigned int *int_stack = stack;
670 /* fetch the saved %gs from the stack */
671 wine_set_gs( int_stack[0] );
674 else /* 32-bit mode */
677 wine_set_gs( GS_sig(sigcontext) );
684 /***********************************************************************
687 * Set the FPU context from a sigcontext.
689 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
692 if (FPU_sig(sigcontext))
694 context->FloatSave = *FPU_sig(sigcontext);
699 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
700 #endif /* __GNUC__ */
704 /***********************************************************************
707 * Restore the FPU context to a sigcontext.
709 inline static void restore_fpu( CONTEXT *context )
711 /* reset the current interrupt status */
712 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
714 /* avoid nested exceptions */
715 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
716 #endif /* __GNUC__ */
720 /***********************************************************************
723 * Setup a proper stack frame for the raise function, and modify the
724 * sigcontext so that the return from the signal handler will call
725 * the raise function.
727 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
731 void *ret_addr; /* return address from raise_func */
732 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
733 CONTEXT *context_ptr; /* second arg for raise_func */
734 void *dummy; /* dummy ret addr for __wine_call_from_32_restore_regs */
736 EXCEPTION_RECORD rec;
743 /* get %fs and %gs at time of the fault */
745 fs = LOWORD(FS_sig(sigcontext));
750 gs = LOWORD(GS_sig(sigcontext));
755 stack = init_handler( sigcontext );
757 /* stack sanity checks */
759 if ((char *)stack >= (char *)get_signal_stack() &&
760 (char *)stack < (char *)get_signal_stack() + SIGNAL_STACK_SIZE)
762 ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
763 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
764 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
765 server_abort_thread(1);
768 if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
769 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
771 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack;
774 ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
775 diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
776 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
777 server_abort_thread(1);
779 else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
780 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
781 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
784 stack--; /* push the stack_layout structure */
785 stack->ret_addr = __wine_call_from_32_restore_regs;
786 stack->rec_ptr = &stack->rec;
787 stack->context_ptr = &stack->context;
789 stack->rec.ExceptionRecord = NULL;
790 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
791 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
792 stack->rec.NumberParameters = 0;
794 stack->context.ContextFlags = CONTEXT_FULL;
795 stack->context.Eax = EAX_sig(sigcontext);
796 stack->context.Ebx = EBX_sig(sigcontext);
797 stack->context.Ecx = ECX_sig(sigcontext);
798 stack->context.Edx = EDX_sig(sigcontext);
799 stack->context.Esi = ESI_sig(sigcontext);
800 stack->context.Edi = EDI_sig(sigcontext);
801 stack->context.Ebp = EBP_sig(sigcontext);
802 stack->context.EFlags = EFL_sig(sigcontext);
803 stack->context.Eip = EIP_sig(sigcontext);
804 stack->context.Esp = ESP_sig(sigcontext);
805 stack->context.SegCs = LOWORD(CS_sig(sigcontext));
806 stack->context.SegDs = LOWORD(DS_sig(sigcontext));
807 stack->context.SegEs = LOWORD(ES_sig(sigcontext));
808 stack->context.SegFs = fs;
809 stack->context.SegGs = gs;
810 stack->context.SegSs = LOWORD(SS_sig(sigcontext));
812 /* now modify the sigcontext to return to the raise function */
813 ESP_sig(sigcontext) = (DWORD)stack;
814 EIP_sig(sigcontext) = (DWORD)func;
815 CS_sig(sigcontext) = wine_get_cs();
816 DS_sig(sigcontext) = wine_get_ds();
817 ES_sig(sigcontext) = wine_get_es();
818 FS_sig(sigcontext) = wine_get_fs();
819 GS_sig(sigcontext) = wine_get_gs();
820 SS_sig(sigcontext) = wine_get_ss();
822 return stack->rec_ptr;
826 /***********************************************************************
827 * get_exception_context
829 * Get a pointer to the context built by setup_exception.
831 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
833 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
837 /**********************************************************************
840 * Get the FPU exception code from the FPU status.
842 static inline DWORD get_fpu_code( const CONTEXT *context )
844 DWORD status = context->FloatSave.StatusWord;
846 if (status & 0x01) /* IE */
848 if (status & 0x40) /* SF */
849 return EXCEPTION_FLT_STACK_CHECK;
851 return EXCEPTION_FLT_INVALID_OPERATION;
853 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
854 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
855 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
856 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
857 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
858 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
862 /**********************************************************************
863 * raise_segv_exception
865 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
867 switch(rec->ExceptionCode)
869 case EXCEPTION_ACCESS_VIOLATION:
870 if (rec->NumberParameters == 2)
872 if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] )))
876 case EXCEPTION_DATATYPE_MISALIGNMENT:
877 /* FIXME: pass through exception handler first? */
878 if (context->EFlags & 0x00040000)
880 /* Disable AC flag, return */
881 context->EFlags &= ~0x00040000;
886 __regs_RtlRaiseException( rec, context );
890 /**********************************************************************
891 * raise_trap_exception
893 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
895 DWORD dr0, dr1, dr2, dr3, dr6, dr7;
897 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
899 if (context->EFlags & 0x100)
901 context->EFlags &= ~0x100; /* clear single-step flag */
903 else /* hardware breakpoint, fetch the debug registers */
905 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
906 NtGetContextThread(GetCurrentThread(), context);
907 /* do we really have a bp from a debug register ?
908 * if not, then someone did a kill(SIGTRAP) on us, and we
909 * shall return a breakpoint, not a single step exception
911 if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
922 __regs_RtlRaiseException( rec, context );
924 if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
925 dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
927 /* the debug registers have changed, set the new values */
928 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
929 NtSetContextThread(GetCurrentThread(), context);
934 /**********************************************************************
935 * raise_fpu_exception
937 static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
939 __regs_RtlRaiseException( rec, context );
940 restore_fpu( context );
945 /**********************************************************************
946 * raise_vm86_sti_exception
948 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
950 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
951 NtCurrentTeb()->vm86_pending |= VIP_MASK;
953 if (NtCurrentTeb()->vm86_ptr)
955 if (((char*)context->Eip >= (char*)vm86_return) &&
956 ((char*)context->Eip <= (char*)vm86_return_end) &&
957 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
958 /* exiting from VM86, can't throw */
961 merge_vm86_pending_flags( rec );
963 else if (NtCurrentTeb()->dpmi_vif &&
964 !wine_ldt_is_system(context->SegCs) &&
965 !wine_ldt_is_system(context->SegSs))
967 /* Executing DPMI code and virtual interrupts are enabled. */
968 NtCurrentTeb()->vm86_pending = 0;
969 __regs_RtlRaiseException( rec, context );
974 /**********************************************************************
977 * Handler for SIGUSR2.
978 * We use it to signal that the running __wine_enter_vm86() should
979 * immediately set VIP_MASK, causing pending events to be handled
980 * as early as possible.
982 static HANDLER_DEF(usr2_handler)
984 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
985 rec->ExceptionCode = EXCEPTION_VM86_STI;
987 #endif /* __HAVE_VM86 */
990 /**********************************************************************
993 * Handler for SIGSEGV and related errors.
995 static HANDLER_DEF(segv_handler)
997 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
999 switch(get_trap_code(HANDLER_CONTEXT))
1001 case T_OFLOW: /* Overflow exception */
1002 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1004 case T_BOUND: /* Bound range exception */
1005 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1007 case T_PRIVINFLT: /* Invalid opcode exception */
1008 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1010 case T_STKFLT: /* Stack fault */
1011 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1013 case T_SEGNPFLT: /* Segment not present exception */
1014 case T_PROTFLT: /* General protection fault */
1015 case T_UNKNOWN: /* Unknown fault code */
1016 rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
1017 : EXCEPTION_PRIV_INSTRUCTION;
1019 case T_PAGEFLT: /* Page fault */
1020 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1021 #ifdef FAULT_ADDRESS
1022 rec->NumberParameters = 2;
1023 rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
1024 rec->ExceptionInformation[1] = (ULONG_PTR)FAULT_ADDRESS;
1027 case T_ALIGNFLT: /* Alignment check exception */
1028 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1031 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1033 case T_NMI: /* NMI interrupt */
1034 case T_DNA: /* Device not available exception */
1035 case T_DOUBLEFLT: /* Double fault exception */
1036 case T_TSSFLT: /* Invalid TSS exception */
1037 case T_RESERVED: /* Unknown exception */
1038 case T_MCHK: /* Machine check exception */
1040 case T_CACHEFLT: /* Cache flush exception */
1042 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1048 /**********************************************************************
1051 * Handler for SIGTRAP.
1053 static HANDLER_DEF(trap_handler)
1055 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
1057 switch(get_trap_code(HANDLER_CONTEXT))
1059 case T_TRCTRAP: /* Single-step exception */
1060 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1061 EFL_sig(HANDLER_CONTEXT) &= ~0x100; /* clear single-step flag */
1063 case T_BPTFLT: /* Breakpoint exception */
1064 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1067 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1073 /**********************************************************************
1076 * Handler for SIGFPE.
1078 static HANDLER_DEF(fpe_handler)
1080 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception );
1083 context = get_exception_context( rec );
1084 save_fpu( context, HANDLER_CONTEXT );
1086 switch(get_trap_code(HANDLER_CONTEXT))
1088 case T_DIVIDE: /* Division by zero exception */
1089 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1091 case T_FPOPFLT: /* Coprocessor segment overrun */
1092 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1094 case T_ARITHTRAP: /* Floating point exception */
1095 case T_UNKNOWN: /* Unknown fault code */
1096 rec->ExceptionCode = get_fpu_code( context );
1099 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1100 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1106 /**********************************************************************
1109 * Handler for SIGINT.
1111 static HANDLER_DEF(int_handler)
1113 init_handler( HANDLER_CONTEXT );
1114 if (!dispatch_signal(SIGINT))
1116 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, __regs_RtlRaiseException );
1117 rec->ExceptionCode = CONTROL_C_EXIT;
1121 /**********************************************************************
1124 * Handler for SIGABRT.
1126 static HANDLER_DEF(abrt_handler)
1128 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, __regs_RtlRaiseException );
1129 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1130 rec->ExceptionFlags = EH_NONCONTINUABLE;
1134 /**********************************************************************
1137 * Handler for SIGTERM.
1139 static HANDLER_DEF(term_handler)
1141 init_handler( HANDLER_CONTEXT );
1142 server_abort_thread(0);
1146 /**********************************************************************
1149 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1151 static HANDLER_DEF(usr1_handler)
1153 LARGE_INTEGER timeout;
1155 init_handler( HANDLER_CONTEXT );
1156 /* wait with 0 timeout, will only return once the thread is no longer suspended */
1157 timeout.QuadPart = 0;
1158 NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout, 0 );
1162 /***********************************************************************
1165 * Set a signal handler
1167 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1169 struct sigaction sig_act;
1172 if (!have_sigaltstack)
1174 struct kernel_sigaction sig_act;
1175 sig_act.ksa_handler = func;
1176 sig_act.ksa_flags = SA_RESTART;
1177 sig_act.ksa_mask = (1 << (SIGINT-1)) |
1179 /* point to the top of the signal stack */
1180 sig_act.ksa_restorer = (char *)get_signal_stack() + SIGNAL_STACK_SIZE;
1181 return wine_sigaction( sig, &sig_act, NULL );
1184 sig_act.sa_handler = func;
1185 sigemptyset( &sig_act.sa_mask );
1186 sigaddset( &sig_act.sa_mask, SIGINT );
1187 sigaddset( &sig_act.sa_mask, SIGUSR2 );
1189 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
1190 sig_act.sa_flags = SA_RESTART;
1191 #elif defined (__svr4__) || defined(_SCO_DS)
1192 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1194 sig_act.sa_flags = 0;
1198 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1200 return sigaction( sig, &sig_act, NULL );
1204 /***********************************************************************
1205 * __wine_set_signal_handler (NTDLL.@)
1207 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1209 if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1210 if (handlers[sig] != NULL) return -2;
1211 handlers[sig] = wsh;
1216 /**********************************************************************
1219 BOOL SIGNAL_Init(void)
1221 int have_sigaltstack = 0;
1223 #ifdef HAVE_SIGALTSTACK
1224 struct sigaltstack ss;
1225 ss.ss_sp = get_signal_stack();
1226 ss.ss_size = SIGNAL_STACK_SIZE;
1228 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1230 /* sigaltstack may fail because the kernel is too old, or
1231 because glibc is brain-dead. In the latter case a
1232 direct system call should succeed. */
1233 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1235 #endif /* HAVE_SIGALTSTACK */
1237 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1238 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1239 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1240 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1241 if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1242 if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1243 if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1245 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1248 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1252 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1258 perror("sigaction");
1264 /**********************************************************************
1265 * __wine_enter_vm86 (NTDLL.@)
1267 * Enter vm86 mode with the specified register context.
1269 void __wine_enter_vm86( CONTEXT *context )
1271 EXCEPTION_RECORD rec;
1272 TEB *teb = NtCurrentTeb();
1274 struct vm86plus_struct vm86;
1276 memset( &vm86, 0, sizeof(vm86) );
1279 restore_vm86_context( context, &vm86 );
1281 teb->vm86_ptr = &vm86;
1282 merge_vm86_pending_flags( &rec );
1284 res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1291 save_vm86_context( context, &vm86 );
1293 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1294 rec.ExceptionRecord = NULL;
1295 rec.ExceptionAddress = (LPVOID)context->Eip;
1296 rec.NumberParameters = 0;
1298 switch(VM86_TYPE(res))
1300 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1301 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1302 raise_segv_exception( &rec, context );
1304 case VM86_TRAP: /* return due to DOS-debugger request */
1305 switch(VM86_ARG(res))
1307 case T_TRCTRAP: /* Single-step exception, single step flag is cleared by raise_trap_exception */
1308 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1310 case T_BPTFLT: /* Breakpoint exception */
1311 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1314 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1317 raise_trap_exception( &rec, context );
1319 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1320 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1321 rec.NumberParameters = 1;
1322 rec.ExceptionInformation[0] = VM86_ARG(res);
1324 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1325 context->EFlags |= VIF_MASK;
1326 context->EFlags &= ~VIP_MASK;
1327 teb->vm86_pending = 0;
1328 rec.ExceptionCode = EXCEPTION_VM86_STI;
1330 case VM86_PICRETURN: /* return due to pending PIC request */
1331 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1333 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1335 ERR( "unhandled result from vm86 mode %x\n", res );
1338 __regs_RtlRaiseException( &rec, context );
1342 #else /* __HAVE_VM86 */
1343 /**********************************************************************
1344 * __wine_enter_vm86 (NTDLL.@)
1346 void __wine_enter_vm86( CONTEXT *context )
1348 MESSAGE("vm86 mode not supported on this platform\n");
1350 #endif /* __HAVE_VM86 */
1352 /**********************************************************************
1353 * DbgBreakPoint (NTDLL.@)
1355 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1357 /**********************************************************************
1358 * DbgUserBreakPoint (NTDLL.@)
1360 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1362 #endif /* __i386__ */