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), "r" (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), "r" (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, void *__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__ */
296 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
297 defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
299 #define EAX_sig(context) ((context)->sc_eax)
300 #define EBX_sig(context) ((context)->sc_ebx)
301 #define ECX_sig(context) ((context)->sc_ecx)
302 #define EDX_sig(context) ((context)->sc_edx)
303 #define ESI_sig(context) ((context)->sc_esi)
304 #define EDI_sig(context) ((context)->sc_edi)
305 #define EBP_sig(context) ((context)->sc_ebp)
307 #define CS_sig(context) ((context)->sc_cs)
308 #define DS_sig(context) ((context)->sc_ds)
309 #define ES_sig(context) ((context)->sc_es)
310 #define FS_sig(context) ((context)->sc_fs)
311 #define GS_sig(context) ((context)->sc_gs)
312 #define SS_sig(context) ((context)->sc_ss)
314 #define TRAP_sig(context) ((context)->sc_trapno)
317 #define ERROR_sig(context) ((context)->sc_err)
321 #define ERROR_sig(context) ((context)->sc_err)
322 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
323 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
327 #define EFL_sig(context) ((context)->sc_efl)
328 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
329 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
331 #define EFL_sig(context) ((context)->sc_eflags)
334 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
335 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
337 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
339 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
345 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
346 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
347 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
348 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
349 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
350 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
351 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
353 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
354 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
355 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
356 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
358 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
359 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
361 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
363 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
365 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
367 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
370 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
373 #define FAULT_ADDRESS (__siginfo->si_addr)
375 #endif /* svr4 || SCO_DS */
378 /* exception code definitions (already defined by FreeBSD/NetBSD) */
379 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
380 #define T_DIVIDE 0 /* Division by zero exception */
381 #define T_TRCTRAP 1 /* Single-step exception */
382 #define T_NMI 2 /* NMI interrupt */
383 #define T_BPTFLT 3 /* Breakpoint exception */
384 #define T_OFLOW 4 /* Overflow exception */
385 #define T_BOUND 5 /* Bound range exception */
386 #define T_PRIVINFLT 6 /* Invalid opcode exception */
387 #define T_DNA 7 /* Device not available exception */
388 #define T_DOUBLEFLT 8 /* Double fault exception */
389 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
390 #define T_TSSFLT 10 /* Invalid TSS exception */
391 #define T_SEGNPFLT 11 /* Segment not present exception */
392 #define T_STKFLT 12 /* Stack fault */
393 #define T_PROTFLT 13 /* General protection fault */
394 #define T_PAGEFLT 14 /* Page fault */
395 #define T_RESERVED 15 /* Unknown exception */
396 #define T_ARITHTRAP 16 /* Floating point exception */
397 #define T_ALIGNFLT 17 /* Alignment check exception */
398 #define T_MCHK 18 /* Machine check exception */
399 #define T_CACHEFLT 19 /* Cache flush exception */
401 #if defined(__NetBSD__)
402 #define T_MCHK 19 /* Machine check exception */
405 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
407 #include "wine/exception.h"
409 #include "wine/debug.h"
411 WINE_DEFAULT_DEBUG_CHANNEL(seh);
413 typedef int (*wine_signal_handler)(unsigned int sig);
415 static wine_signal_handler handlers[256];
417 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
418 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context );
421 /***********************************************************************
424 inline static int dispatch_signal(unsigned int sig)
426 if (handlers[sig] == NULL) return 0;
427 return handlers[sig](sig);
431 /***********************************************************************
434 * Get the trap code for a signal.
436 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
439 return TRAP_sig(sigcontext);
441 return T_UNKNOWN; /* unknown trap code */
445 /***********************************************************************
448 * Get the error code for a signal.
450 static inline int get_error_code( const SIGCONTEXT *sigcontext )
453 return ERROR_sig(sigcontext);
459 /***********************************************************************
462 * Get the base of the signal stack for the current thread.
464 static inline void *get_signal_stack(void)
466 return (char *)NtCurrentTeb() + 4096;
470 /***********************************************************************
473 * Get the current teb based on the stack pointer.
475 static inline TEB *get_current_teb(void)
478 __asm__("movl %%esp,%0" : "=g" (esp) );
479 return (TEB *)((esp & ~4095) - 4096);
484 /***********************************************************************
487 * Set the register values from a vm86 structure.
489 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
491 context->Eax = vm86->regs.eax;
492 context->Ebx = vm86->regs.ebx;
493 context->Ecx = vm86->regs.ecx;
494 context->Edx = vm86->regs.edx;
495 context->Esi = vm86->regs.esi;
496 context->Edi = vm86->regs.edi;
497 context->Esp = vm86->regs.esp;
498 context->Ebp = vm86->regs.ebp;
499 context->Eip = vm86->regs.eip;
500 context->SegCs = vm86->regs.cs;
501 context->SegDs = vm86->regs.ds;
502 context->SegEs = vm86->regs.es;
503 context->SegFs = vm86->regs.fs;
504 context->SegGs = vm86->regs.gs;
505 context->SegSs = vm86->regs.ss;
506 context->EFlags = vm86->regs.eflags;
510 /***********************************************************************
511 * restore_vm86_context
513 * Build a vm86 structure from the register values.
515 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
517 vm86->regs.eax = context->Eax;
518 vm86->regs.ebx = context->Ebx;
519 vm86->regs.ecx = context->Ecx;
520 vm86->regs.edx = context->Edx;
521 vm86->regs.esi = context->Esi;
522 vm86->regs.edi = context->Edi;
523 vm86->regs.esp = context->Esp;
524 vm86->regs.ebp = context->Ebp;
525 vm86->regs.eip = context->Eip;
526 vm86->regs.cs = context->SegCs;
527 vm86->regs.ds = context->SegDs;
528 vm86->regs.es = context->SegEs;
529 vm86->regs.fs = context->SegFs;
530 vm86->regs.gs = context->SegGs;
531 vm86->regs.ss = context->SegSs;
532 vm86->regs.eflags = context->EFlags;
536 /**********************************************************************
537 * merge_vm86_pending_flags
539 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
540 * raises exception if there are pending events and VIF flag
541 * has been turned on.
543 * Called from __wine_enter_vm86 because vm86_enter
544 * doesn't check for pending events.
546 * Called from raise_vm86_sti_exception to check for
547 * pending events in a signal safe way.
549 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
551 BOOL check_pending = TRUE;
552 struct vm86plus_struct *vm86 =
553 (struct vm86plus_struct*)(NtCurrentTeb()->vm86_ptr);
556 * In order to prevent a race when SIGUSR2 occurs while
557 * we are returning from exception handler, pending events
558 * will be rechecked after each raised exception.
560 while (check_pending && NtCurrentTeb()->vm86_pending)
562 check_pending = FALSE;
563 NtCurrentTeb()->vm86_ptr = NULL;
566 * If VIF is set, throw exception.
567 * Note that SIGUSR2 may turn VIF flag off so
568 * VIF check must occur only when TEB.vm86_ptr is NULL.
570 if (vm86->regs.eflags & VIF_MASK)
573 save_vm86_context( &vcontext, vm86 );
575 rec->ExceptionCode = EXCEPTION_VM86_STI;
576 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
577 rec->ExceptionRecord = NULL;
578 rec->NumberParameters = 0;
579 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
581 vcontext.EFlags &= ~VIP_MASK;
582 NtCurrentTeb()->vm86_pending = 0;
583 EXC_RtlRaiseException( rec, &vcontext );
585 restore_vm86_context( &vcontext, vm86 );
586 check_pending = TRUE;
589 NtCurrentTeb()->vm86_ptr = vm86;
593 * Merge VIP flags in a signal safe way. This requires
594 * that the following operation compiles into atomic
597 vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
599 #endif /* __HAVE_VM86 */
602 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
605 /***********************************************************************
608 * Handler initialization when the full context is not needed.
610 static void *init_handler( const SIGCONTEXT *sigcontext )
612 void *stack = (void *)ESP_sig(sigcontext);
613 TEB *teb = get_current_teb();
615 wine_set_fs( teb->teb_sel );
617 /* now restore a proper %gs for the fault handler */
618 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
619 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
622 * Win16 or DOS protected mode. Note that during switch
623 * from 16-bit mode to linear mode, CS may be set to system
624 * segment before FS is restored. Fortunately, in this case
625 * SS is still non-system segment. This is why both CS and SS
628 wine_set_gs( teb->gs_sel );
629 stack = (void *)teb->cur_stack;
632 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
634 unsigned int *int_stack = stack;
635 /* fetch the saved %gs from the stack */
636 wine_set_gs( int_stack[0] );
639 else /* 32-bit mode */
642 wine_set_gs( GS_sig(sigcontext) );
649 /***********************************************************************
652 * Set the FPU context from a sigcontext.
654 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
657 if (FPU_sig(sigcontext))
659 context->FloatSave = *FPU_sig(sigcontext);
664 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
665 #endif /* __GNUC__ */
669 /***********************************************************************
672 * Restore the FPU context to a sigcontext.
674 inline static void restore_fpu( CONTEXT *context )
676 /* reset the current interrupt status */
677 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
679 /* avoid nested exceptions */
680 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
681 #endif /* __GNUC__ */
685 /***********************************************************************
688 * Setup a proper stack frame for the raise function, and modify the
689 * sigcontext so that the return from the signal handler will call
690 * the raise function.
692 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
696 void *ret_addr; /* return address from raise_func */
697 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
698 CONTEXT *context_ptr; /* second arg for raise_func */
699 void *dummy; /* dummy ret addr for __wine_call_from_32_restore_regs */
701 EXCEPTION_RECORD rec;
708 /* get %fs and %gs at time of the fault */
710 fs = LOWORD(FS_sig(sigcontext));
715 gs = LOWORD(GS_sig(sigcontext));
720 stack = init_handler( sigcontext );
722 /* stack sanity checks */
724 if ((char *)stack >= (char *)get_signal_stack() &&
725 (char *)stack < (char *)get_signal_stack() + SIGNAL_STACK_SIZE)
727 ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
728 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
729 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
730 server_abort_thread(1);
733 if ((char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
734 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
736 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack;
739 ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
740 diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
741 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
742 server_abort_thread(1);
744 else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
745 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
746 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
749 stack--; /* push the stack_layout structure */
750 stack->ret_addr = __wine_call_from_32_restore_regs;
751 stack->rec_ptr = &stack->rec;
752 stack->context_ptr = &stack->context;
754 stack->rec.ExceptionRecord = NULL;
755 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
756 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
757 stack->rec.NumberParameters = 0;
759 stack->context.ContextFlags = CONTEXT_FULL;
760 stack->context.Eax = EAX_sig(sigcontext);
761 stack->context.Ebx = EBX_sig(sigcontext);
762 stack->context.Ecx = ECX_sig(sigcontext);
763 stack->context.Edx = EDX_sig(sigcontext);
764 stack->context.Esi = ESI_sig(sigcontext);
765 stack->context.Edi = EDI_sig(sigcontext);
766 stack->context.Ebp = EBP_sig(sigcontext);
767 stack->context.EFlags = EFL_sig(sigcontext);
768 stack->context.Eip = EIP_sig(sigcontext);
769 stack->context.Esp = ESP_sig(sigcontext);
770 stack->context.SegCs = LOWORD(CS_sig(sigcontext));
771 stack->context.SegDs = LOWORD(DS_sig(sigcontext));
772 stack->context.SegEs = LOWORD(ES_sig(sigcontext));
773 stack->context.SegFs = fs;
774 stack->context.SegGs = gs;
775 stack->context.SegSs = LOWORD(SS_sig(sigcontext));
777 /* now modify the sigcontext to return to the raise function */
778 ESP_sig(sigcontext) = (DWORD)stack;
779 EIP_sig(sigcontext) = (DWORD)func;
780 CS_sig(sigcontext) = wine_get_cs();
781 DS_sig(sigcontext) = wine_get_ds();
782 ES_sig(sigcontext) = wine_get_es();
783 FS_sig(sigcontext) = wine_get_fs();
784 GS_sig(sigcontext) = wine_get_gs();
785 SS_sig(sigcontext) = wine_get_ss();
787 return stack->rec_ptr;
791 /***********************************************************************
792 * get_exception_context
794 * Get a pointer to the context built by setup_exception.
796 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
798 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
802 /**********************************************************************
805 * Get the FPU exception code from the FPU status.
807 static inline DWORD get_fpu_code( const CONTEXT *context )
809 DWORD status = context->FloatSave.StatusWord;
811 if (status & 0x01) /* IE */
813 if (status & 0x40) /* SF */
814 return EXCEPTION_FLT_STACK_CHECK;
816 return EXCEPTION_FLT_INVALID_OPERATION;
818 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
819 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
820 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
821 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
822 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
823 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
827 /**********************************************************************
828 * raise_segv_exception
830 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
832 switch(rec->ExceptionCode)
834 case EXCEPTION_ACCESS_VIOLATION:
835 if (rec->NumberParameters == 2)
837 if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] )))
841 case EXCEPTION_DATATYPE_MISALIGNMENT:
842 /* FIXME: pass through exception handler first? */
843 if (context->EFlags & 0x00040000)
845 /* Disable AC flag, return */
846 context->EFlags &= ~0x00040000;
851 EXC_RtlRaiseException( rec, context );
855 /**********************************************************************
856 * raise_trap_exception
858 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
860 DWORD dr0, dr1, dr2, dr3, dr6, dr7;
862 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
864 if (context->EFlags & 0x100)
866 context->EFlags &= ~0x100; /* clear single-step flag */
868 else /* hardware breakpoint, fetch the debug registers */
870 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
871 NtGetContextThread(GetCurrentThread(), context);
872 /* do we really have a bp from a debug register ?
873 * if not, then someone did a kill(SIGTRAP) on us, and we
874 * shall return a breakpoint, not a single step exception
876 if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
887 EXC_RtlRaiseException( rec, context );
889 if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
890 dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
892 /* the debug registers have changed, set the new values */
893 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
894 NtSetContextThread(GetCurrentThread(), context);
899 /**********************************************************************
900 * raise_fpu_exception
902 static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
904 EXC_RtlRaiseException( rec, context );
905 restore_fpu( context );
910 /**********************************************************************
911 * raise_vm86_sti_exception
913 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
915 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
916 NtCurrentTeb()->vm86_pending |= VIP_MASK;
918 if (NtCurrentTeb()->vm86_ptr)
920 if (((char*)context->Eip >= (char*)vm86_return) &&
921 ((char*)context->Eip <= (char*)vm86_return_end) &&
922 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
923 /* exiting from VM86, can't throw */
926 merge_vm86_pending_flags( rec );
928 else if (NtCurrentTeb()->dpmi_vif &&
929 !wine_ldt_is_system(context->SegCs) &&
930 !wine_ldt_is_system(context->SegSs))
932 /* Executing DPMI code and virtual interrupts are enabled. */
933 NtCurrentTeb()->vm86_pending = 0;
934 EXC_RtlRaiseException( rec, context );
939 /**********************************************************************
942 * Handler for SIGUSR2.
943 * We use it to signal that the running __wine_enter_vm86() should
944 * immediately set VIP_MASK, causing pending events to be handled
945 * as early as possible.
947 static HANDLER_DEF(usr2_handler)
949 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
950 rec->ExceptionCode = EXCEPTION_VM86_STI;
952 #endif /* __HAVE_VM86 */
955 /**********************************************************************
958 * Handler for SIGSEGV and related errors.
960 static HANDLER_DEF(segv_handler)
962 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
964 switch(get_trap_code(HANDLER_CONTEXT))
966 case T_OFLOW: /* Overflow exception */
967 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
969 case T_BOUND: /* Bound range exception */
970 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
972 case T_PRIVINFLT: /* Invalid opcode exception */
973 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
975 case T_STKFLT: /* Stack fault */
976 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
978 case T_SEGNPFLT: /* Segment not present exception */
979 case T_PROTFLT: /* General protection fault */
980 case T_UNKNOWN: /* Unknown fault code */
981 rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
982 : EXCEPTION_PRIV_INSTRUCTION;
984 case T_PAGEFLT: /* Page fault */
985 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
987 rec->NumberParameters = 2;
988 rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
989 rec->ExceptionInformation[1] = (DWORD)FAULT_ADDRESS;
992 case T_ALIGNFLT: /* Alignment check exception */
993 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
996 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
998 case T_NMI: /* NMI interrupt */
999 case T_DNA: /* Device not available exception */
1000 case T_DOUBLEFLT: /* Double fault exception */
1001 case T_TSSFLT: /* Invalid TSS exception */
1002 case T_RESERVED: /* Unknown exception */
1003 case T_MCHK: /* Machine check exception */
1005 case T_CACHEFLT: /* Cache flush exception */
1007 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1013 /**********************************************************************
1016 * Handler for SIGTRAP.
1018 static HANDLER_DEF(trap_handler)
1020 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
1022 switch(get_trap_code(HANDLER_CONTEXT))
1024 case T_TRCTRAP: /* Single-step exception */
1025 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1026 EFL_sig(HANDLER_CONTEXT) &= ~0x100; /* clear single-step flag */
1028 case T_BPTFLT: /* Breakpoint exception */
1029 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1032 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1038 /**********************************************************************
1041 * Handler for SIGFPE.
1043 static HANDLER_DEF(fpe_handler)
1045 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception );
1048 context = get_exception_context( rec );
1049 save_fpu( context, HANDLER_CONTEXT );
1051 switch(get_trap_code(HANDLER_CONTEXT))
1053 case T_DIVIDE: /* Division by zero exception */
1054 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1056 case T_FPOPFLT: /* Coprocessor segment overrun */
1057 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1059 case T_ARITHTRAP: /* Floating point exception */
1060 case T_UNKNOWN: /* Unknown fault code */
1061 rec->ExceptionCode = get_fpu_code( context );
1064 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1065 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1071 /**********************************************************************
1074 * Handler for SIGINT.
1076 static HANDLER_DEF(int_handler)
1078 init_handler( HANDLER_CONTEXT );
1079 if (!dispatch_signal(SIGINT))
1081 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
1082 rec->ExceptionCode = CONTROL_C_EXIT;
1086 /**********************************************************************
1089 * Handler for SIGABRT.
1091 static HANDLER_DEF(abrt_handler)
1093 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, EXC_RtlRaiseException );
1094 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1095 rec->ExceptionFlags = EH_NONCONTINUABLE;
1099 /**********************************************************************
1102 * Handler for SIGTERM.
1104 static HANDLER_DEF(term_handler)
1106 init_handler( HANDLER_CONTEXT );
1107 server_abort_thread(0);
1111 /**********************************************************************
1114 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1116 static HANDLER_DEF(usr1_handler)
1118 LARGE_INTEGER timeout;
1120 init_handler( HANDLER_CONTEXT );
1121 /* wait with 0 timeout, will only return once the thread is no longer suspended */
1122 timeout.QuadPart = 0;
1123 NTDLL_wait_for_multiple_objects( 0, NULL, 0, &timeout );
1127 /***********************************************************************
1130 * Set a signal handler
1132 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1134 struct sigaction sig_act;
1137 if (!have_sigaltstack)
1139 struct kernel_sigaction sig_act;
1140 sig_act.ksa_handler = func;
1141 sig_act.ksa_flags = SA_RESTART;
1142 sig_act.ksa_mask = (1 << (SIGINT-1)) |
1144 /* point to the top of the signal stack */
1145 sig_act.ksa_restorer = (char *)get_signal_stack() + SIGNAL_STACK_SIZE;
1146 return wine_sigaction( sig, &sig_act, NULL );
1149 sig_act.sa_handler = func;
1150 sigemptyset( &sig_act.sa_mask );
1151 sigaddset( &sig_act.sa_mask, SIGINT );
1152 sigaddset( &sig_act.sa_mask, SIGUSR2 );
1154 #if defined(linux) || defined(__NetBSD__)
1155 sig_act.sa_flags = SA_RESTART;
1156 #elif defined (__svr4__) || defined(_SCO_DS)
1157 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1159 sig_act.sa_flags = 0;
1163 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1165 return sigaction( sig, &sig_act, NULL );
1169 /***********************************************************************
1170 * __wine_set_signal_handler (NTDLL.@)
1172 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1174 if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1175 if (handlers[sig] != NULL) return -2;
1176 handlers[sig] = wsh;
1181 /**********************************************************************
1184 BOOL SIGNAL_Init(void)
1186 int have_sigaltstack = 0;
1188 #ifdef HAVE_SIGALTSTACK
1189 struct sigaltstack ss;
1190 ss.ss_sp = get_signal_stack();
1191 ss.ss_size = SIGNAL_STACK_SIZE;
1193 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1195 /* sigaltstack may fail because the kernel is too old, or
1196 because glibc is brain-dead. In the latter case a
1197 direct system call should succeed. */
1198 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1200 #endif /* HAVE_SIGALTSTACK */
1202 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1203 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1204 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1205 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1206 if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1207 if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1208 if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1210 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1213 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1217 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1223 perror("sigaction");
1229 /**********************************************************************
1230 * __wine_enter_vm86 (NTDLL.@)
1232 * Enter vm86 mode with the specified register context.
1234 void __wine_enter_vm86( CONTEXT *context )
1236 EXCEPTION_RECORD rec;
1237 TEB *teb = NtCurrentTeb();
1239 struct vm86plus_struct vm86;
1241 memset( &vm86, 0, sizeof(vm86) );
1244 restore_vm86_context( context, &vm86 );
1246 teb->vm86_ptr = &vm86;
1247 merge_vm86_pending_flags( &rec );
1249 res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1256 save_vm86_context( context, &vm86 );
1258 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1259 rec.ExceptionRecord = NULL;
1260 rec.ExceptionAddress = (LPVOID)context->Eip;
1261 rec.NumberParameters = 0;
1263 switch(VM86_TYPE(res))
1265 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1266 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1267 raise_segv_exception( &rec, context );
1269 case VM86_TRAP: /* return due to DOS-debugger request */
1270 switch(VM86_ARG(res))
1272 case T_TRCTRAP: /* Single-step exception */
1273 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1274 context->EFlags &= ~0x100; /* clear single-step flag */
1276 case T_BPTFLT: /* Breakpoint exception */
1277 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1280 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1283 raise_trap_exception( &rec, context );
1285 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1286 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1287 rec.NumberParameters = 1;
1288 rec.ExceptionInformation[0] = VM86_ARG(res);
1290 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1291 context->EFlags |= VIF_MASK;
1292 context->EFlags &= ~VIP_MASK;
1293 teb->vm86_pending = 0;
1294 rec.ExceptionCode = EXCEPTION_VM86_STI;
1296 case VM86_PICRETURN: /* return due to pending PIC request */
1297 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1299 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1301 ERR( "unhandled result from vm86 mode %x\n", res );
1304 EXC_RtlRaiseException( &rec, context );
1308 #else /* __HAVE_VM86 */
1309 /**********************************************************************
1310 * __wine_enter_vm86 (NTDLL.@)
1312 void __wine_enter_vm86( CONTEXT *context )
1314 MESSAGE("vm86 mode not supported on this platform\n");
1316 #endif /* __HAVE_VM86 */
1318 /**********************************************************************
1319 * DbgBreakPoint (NTDLL.@)
1321 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1323 /**********************************************************************
1324 * DbgUserBreakPoint (NTDLL.@)
1326 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1328 #endif /* __i386__ */