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>
56 #include "wine/library.h"
57 #include "ntdll_misc.h"
59 /***********************************************************************
60 * signal context platform-specific definitions
66 unsigned short sc_gs, __gsh;
67 unsigned short sc_fs, __fsh;
68 unsigned short sc_es, __esh;
69 unsigned short sc_ds, __dsh;
78 unsigned long sc_trapno;
81 unsigned short sc_cs, __csh;
82 unsigned long sc_eflags;
83 unsigned long esp_at_signal;
84 unsigned short sc_ss, __ssh;
86 unsigned long oldmask;
88 } volatile SIGCONTEXT;
90 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
91 #define HANDLER_CONTEXT (&__context)
93 /* this is the sigaction structure from the Linux 2.1.20 kernel. */
94 struct kernel_sigaction
96 void (*ksa_handler)();
97 unsigned long ksa_mask;
98 unsigned long ksa_flags;
102 /* Similar to the sigaction function in libc, except it leaves alone the
103 restorer field, which is used to specify the signal stack address */
104 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
105 struct kernel_sigaction *old )
107 __asm__ __volatile__( "pushl %%ebx\n\t"
112 : "0" (SYS_sigaction), "S" (sig), "c" (new), "d" (old) );
113 if (sig>=0) return 0;
118 #ifdef HAVE_SIGALTSTACK
119 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
120 static inline int wine_sigaltstack( const struct sigaltstack *new,
121 struct sigaltstack *old )
124 __asm__ __volatile__( "pushl %%ebx\n\t"
129 : "0" (SYS_sigaltstack), "q" (new), "c" (old) );
130 if (ret >= 0) return 0;
136 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
138 int vm86_enter( void **vm86_ptr );
139 void vm86_return(void);
140 void vm86_return_end(void);
141 __ASM_GLOBAL_FUNC(vm86_enter,
143 "movl %esp, %ebp\n\t"
144 "movl $166,%eax\n\t" /*SYS_vm86*/
145 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
146 "movl (%ecx),%ecx\n\t"
148 "movl $1,%ebx\n\t" /*VM86_ENTER*/
149 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
153 ".globl " __ASM_NAME("vm86_return") "\n\t"
154 __ASM_FUNC("vm86_return") "\n"
155 __ASM_NAME("vm86_return") ":\n\t"
161 "testl %eax,%eax\n\t"
163 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
164 "je " __ASM_NAME("vm86_enter") "\n\t"
166 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
168 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
169 __ASM_FUNC("vm86_return_end") "\n"
170 __ASM_NAME("vm86_return_end") ":\n\t"
173 #ifdef HAVE_SYS_VM86_H
181 #define EAX_sig(context) ((context)->tf_eax)
182 #define EBX_sig(context) ((context)->tf_ebx)
183 #define ECX_sig(context) ((context)->tf_ecx)
184 #define EDX_sig(context) ((context)->tf_edx)
185 #define ESI_sig(context) ((context)->tf_esi)
186 #define EDI_sig(context) ((context)->tf_edi)
187 #define EBP_sig(context) ((context)->tf_ebp)
189 #define CS_sig(context) ((context)->tf_cs)
190 #define DS_sig(context) ((context)->tf_ds)
191 #define ES_sig(context) ((context)->tf_es)
192 #define SS_sig(context) ((context)->tf_ss)
194 #include <machine/frame.h>
195 typedef struct trapframe SIGCONTEXT;
197 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
198 #define HANDLER_CONTEXT __context
200 #define EFL_sig(context) ((context)->tf_eflags)
202 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
203 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
207 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
209 typedef struct sigcontext SIGCONTEXT;
211 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
212 #define HANDLER_CONTEXT __context
216 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
219 #include <sys/regset.h>
223 #include <sys/ucontext.h>
225 typedef struct ucontext SIGCONTEXT;
227 #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
228 #define HANDLER_CONTEXT __context
230 #endif /* svr4 || SCO_DS */
236 unsigned long ContextFlags;
237 FLOATING_SAVE_AREA sc_float;
242 unsigned long sc_edi;
243 unsigned long sc_esi;
244 unsigned long sc_eax;
245 unsigned long sc_ebx;
246 unsigned long sc_ecx;
247 unsigned long sc_edx;
248 unsigned long sc_ebp;
249 unsigned long sc_eip;
251 unsigned long sc_eflags;
252 unsigned long sc_esp;
260 /* FIXME: This section is just here so it can compile, it's most likely
261 * completely wrong. */
265 unsigned short sc_gs, __gsh;
266 unsigned short sc_fs, __fsh;
267 unsigned short sc_es, __esh;
268 unsigned short sc_ds, __dsh;
269 unsigned long sc_edi;
270 unsigned long sc_esi;
271 unsigned long sc_ebp;
272 unsigned long sc_esp;
273 unsigned long sc_ebx;
274 unsigned long sc_edx;
275 unsigned long sc_ecx;
276 unsigned long sc_eax;
277 unsigned long sc_trapno;
278 unsigned long sc_err;
279 unsigned long sc_eip;
280 unsigned short sc_cs, __csh;
281 unsigned long sc_eflags;
282 unsigned long esp_at_signal;
283 unsigned short sc_ss, __ssh;
285 unsigned long oldmask;
289 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
290 #define HANDLER_CONTEXT (&__context)
292 #endif /* __CYGWIN__ */
295 # include <sys/ucontext.h>
296 # include <sys/types.h>
299 typedef ucontext_t SIGCONTEXT;
301 #define EAX_sig(context) ((context)->uc_mcontext->sc.sc_eax)
302 #define EBX_sig(context) ((context)->uc_mcontext->sc.sc_ebx)
303 #define ECX_sig(context) ((context)->uc_mcontext->sc.sc_ecx)
304 #define EDX_sig(context) ((context)->uc_mcontext->sc.sc_edx)
305 #define ESI_sig(context) ((context)->uc_mcontext->sc.sc_esi)
306 #define EDI_sig(context) ((context)->uc_mcontext->sc.sc_edi)
307 #define EBP_sig(context) ((context)->uc_mcontext->sc.sc_ebp)
309 #define CS_sig(context) ((context)->uc_mcontext->sc.sc_cs)
310 #define DS_sig(context) ((context)->uc_mcontext->sc.sc_ds)
311 #define ES_sig(context) ((context)->uc_mcontext->sc.sc_es)
312 #define FS_sig(context) ((context)->uc_mcontext->sc.sc_fs)
313 #define GS_sig(context) ((context)->uc_mcontext->sc.sc_gs)
314 #define SS_sig(context) ((context)->uc_mcontext->sc.sc_ss)
316 #define EFL_sig(context) ((context)->uc_mcontext->sc.sc_eflags)
318 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->sc.sc_eip))
319 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->sc.sc_esp))
321 #define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
322 #define HANDLER_CONTEXT (__context)
324 #define FAULT_ADDRESS (__siginfo->si_addr)
326 #endif /* __APPLE__ */
328 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
329 defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
331 #define EAX_sig(context) ((context)->sc_eax)
332 #define EBX_sig(context) ((context)->sc_ebx)
333 #define ECX_sig(context) ((context)->sc_ecx)
334 #define EDX_sig(context) ((context)->sc_edx)
335 #define ESI_sig(context) ((context)->sc_esi)
336 #define EDI_sig(context) ((context)->sc_edi)
337 #define EBP_sig(context) ((context)->sc_ebp)
339 #define CS_sig(context) ((context)->sc_cs)
340 #define DS_sig(context) ((context)->sc_ds)
341 #define ES_sig(context) ((context)->sc_es)
342 #define FS_sig(context) ((context)->sc_fs)
343 #define GS_sig(context) ((context)->sc_gs)
344 #define SS_sig(context) ((context)->sc_ss)
346 #define TRAP_sig(context) ((context)->sc_trapno)
349 #define ERROR_sig(context) ((context)->sc_err)
353 #define ERROR_sig(context) ((context)->sc_err)
354 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
355 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
359 #define EFL_sig(context) ((context)->sc_efl)
360 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
361 #define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
363 #define EFL_sig(context) ((context)->sc_eflags)
366 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
367 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
369 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
371 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
377 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
378 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
379 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
380 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
381 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
382 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
383 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
385 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
386 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
387 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
388 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
390 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
391 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
393 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
395 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
397 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
399 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
401 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
404 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
407 #define FAULT_ADDRESS (__siginfo->si_addr)
409 #endif /* svr4 || SCO_DS */
411 /* exception code definitions (already defined by FreeBSD/NetBSD) */
412 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
413 #define T_DIVIDE 0 /* Division by zero exception */
414 #define T_TRCTRAP 1 /* Single-step exception */
415 #define T_NMI 2 /* NMI interrupt */
416 #define T_BPTFLT 3 /* Breakpoint exception */
417 #define T_OFLOW 4 /* Overflow exception */
418 #define T_BOUND 5 /* Bound range exception */
419 #define T_PRIVINFLT 6 /* Invalid opcode exception */
420 #define T_DNA 7 /* Device not available exception */
421 #define T_DOUBLEFLT 8 /* Double fault exception */
422 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
423 #define T_TSSFLT 10 /* Invalid TSS exception */
424 #define T_SEGNPFLT 11 /* Segment not present exception */
425 #define T_STKFLT 12 /* Stack fault */
426 #define T_PROTFLT 13 /* General protection fault */
427 #define T_PAGEFLT 14 /* Page fault */
428 #define T_RESERVED 15 /* Unknown exception */
429 #define T_ARITHTRAP 16 /* Floating point exception */
430 #define T_ALIGNFLT 17 /* Alignment check exception */
431 #define T_MCHK 18 /* Machine check exception */
432 #define T_CACHEFLT 19 /* Cache flush exception */
434 #if defined(__NetBSD__)
435 #define T_MCHK 19 /* Machine check exception */
438 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
440 #include "wine/exception.h"
441 #include "wine/debug.h"
443 WINE_DEFAULT_DEBUG_CHANNEL(seh);
445 typedef int (*wine_signal_handler)(unsigned int sig);
447 static size_t signal_stack_mask;
448 static size_t signal_stack_size;
450 static wine_signal_handler handlers[256];
452 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( CONTEXT context );
455 /***********************************************************************
458 inline static int dispatch_signal(unsigned int sig)
460 if (handlers[sig] == NULL) return 0;
461 return handlers[sig](sig);
465 /***********************************************************************
468 * Get the trap code for a signal.
470 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
473 return TRAP_sig(sigcontext);
475 return T_UNKNOWN; /* unknown trap code */
479 /***********************************************************************
482 * Get the error code for a signal.
484 static inline int get_error_code( const SIGCONTEXT *sigcontext )
487 return ERROR_sig(sigcontext);
493 /***********************************************************************
496 * Get the base of the signal stack for the current thread.
498 static inline void *get_signal_stack(void)
500 return (char *)NtCurrentTeb() + 4096;
504 /***********************************************************************
507 * Get the current teb based on the stack pointer.
509 static inline TEB *get_current_teb(void)
512 __asm__("movl %%esp,%0" : "=g" (esp) );
513 return (TEB *)(esp & ~signal_stack_mask);
518 /***********************************************************************
521 * Set the register values from a vm86 structure.
523 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
525 context->Eax = vm86->regs.eax;
526 context->Ebx = vm86->regs.ebx;
527 context->Ecx = vm86->regs.ecx;
528 context->Edx = vm86->regs.edx;
529 context->Esi = vm86->regs.esi;
530 context->Edi = vm86->regs.edi;
531 context->Esp = vm86->regs.esp;
532 context->Ebp = vm86->regs.ebp;
533 context->Eip = vm86->regs.eip;
534 context->SegCs = vm86->regs.cs;
535 context->SegDs = vm86->regs.ds;
536 context->SegEs = vm86->regs.es;
537 context->SegFs = vm86->regs.fs;
538 context->SegGs = vm86->regs.gs;
539 context->SegSs = vm86->regs.ss;
540 context->EFlags = vm86->regs.eflags;
544 /***********************************************************************
545 * restore_vm86_context
547 * Build a vm86 structure from the register values.
549 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
551 vm86->regs.eax = context->Eax;
552 vm86->regs.ebx = context->Ebx;
553 vm86->regs.ecx = context->Ecx;
554 vm86->regs.edx = context->Edx;
555 vm86->regs.esi = context->Esi;
556 vm86->regs.edi = context->Edi;
557 vm86->regs.esp = context->Esp;
558 vm86->regs.ebp = context->Ebp;
559 vm86->regs.eip = context->Eip;
560 vm86->regs.cs = context->SegCs;
561 vm86->regs.ds = context->SegDs;
562 vm86->regs.es = context->SegEs;
563 vm86->regs.fs = context->SegFs;
564 vm86->regs.gs = context->SegGs;
565 vm86->regs.ss = context->SegSs;
566 vm86->regs.eflags = context->EFlags;
570 /**********************************************************************
571 * merge_vm86_pending_flags
573 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
574 * raises exception if there are pending events and VIF flag
575 * has been turned on.
577 * Called from __wine_enter_vm86 because vm86_enter
578 * doesn't check for pending events.
580 * Called from raise_vm86_sti_exception to check for
581 * pending events in a signal safe way.
583 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
585 BOOL check_pending = TRUE;
586 struct vm86plus_struct *vm86 =
587 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
590 * In order to prevent a race when SIGUSR2 occurs while
591 * we are returning from exception handler, pending events
592 * will be rechecked after each raised exception.
594 while (check_pending && NtCurrentTeb()->vm86_pending)
596 check_pending = FALSE;
597 ntdll_get_thread_data()->vm86_ptr = NULL;
600 * If VIF is set, throw exception.
601 * Note that SIGUSR2 may turn VIF flag off so
602 * VIF check must occur only when TEB.vm86_ptr is NULL.
604 if (vm86->regs.eflags & VIF_MASK)
607 save_vm86_context( &vcontext, vm86 );
609 rec->ExceptionCode = EXCEPTION_VM86_STI;
610 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
611 rec->ExceptionRecord = NULL;
612 rec->NumberParameters = 0;
613 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
615 vcontext.EFlags &= ~VIP_MASK;
616 NtCurrentTeb()->vm86_pending = 0;
617 __regs_RtlRaiseException( rec, &vcontext );
619 restore_vm86_context( &vcontext, vm86 );
620 check_pending = TRUE;
623 ntdll_get_thread_data()->vm86_ptr = vm86;
627 * Merge VIP flags in a signal safe way. This requires
628 * that the following operation compiles into atomic
631 vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
633 #endif /* __HAVE_VM86 */
636 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
639 /***********************************************************************
642 * Handler initialization when the full context is not needed.
644 inline static void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
646 void *stack = (void *)ESP_sig(sigcontext);
647 TEB *teb = get_current_teb();
648 struct ntdll_thread_data *thread_data = (struct ntdll_thread_data *)teb->SystemReserved2;
650 /* get %fs and %gs at time of the fault */
652 *fs = LOWORD(FS_sig(sigcontext));
657 *gs = LOWORD(GS_sig(sigcontext));
662 wine_set_fs( thread_data->teb_sel );
664 /* now restore a proper %gs for the fault handler */
665 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
666 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
669 * Win16 or DOS protected mode. Note that during switch
670 * from 16-bit mode to linear mode, CS may be set to system
671 * segment before FS is restored. Fortunately, in this case
672 * SS is still non-system segment. This is why both CS and SS
675 wine_set_gs( teb->gs_sel );
676 stack = teb->WOW32Reserved;
679 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
681 unsigned int *int_stack = stack;
682 /* fetch the saved %gs from the stack */
683 wine_set_gs( int_stack[0] );
686 else /* 32-bit mode */
689 wine_set_gs( GS_sig(sigcontext) );
696 /***********************************************************************
699 * Set the FPU context from a sigcontext.
701 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
704 if (FPU_sig(sigcontext))
706 context->FloatSave = *FPU_sig(sigcontext);
711 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
712 #endif /* __GNUC__ */
716 /***********************************************************************
719 * Restore the FPU context to a sigcontext.
721 inline static void restore_fpu( CONTEXT *context )
723 /* reset the current interrupt status */
724 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
726 /* avoid nested exceptions */
727 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
728 #endif /* __GNUC__ */
732 /***********************************************************************
735 * Build a context structure from the signal info.
737 inline static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
739 context->ContextFlags = CONTEXT_FULL;
740 context->Eax = EAX_sig(sigcontext);
741 context->Ebx = EBX_sig(sigcontext);
742 context->Ecx = ECX_sig(sigcontext);
743 context->Edx = EDX_sig(sigcontext);
744 context->Esi = ESI_sig(sigcontext);
745 context->Edi = EDI_sig(sigcontext);
746 context->Ebp = EBP_sig(sigcontext);
747 context->EFlags = EFL_sig(sigcontext);
748 context->Eip = EIP_sig(sigcontext);
749 context->Esp = ESP_sig(sigcontext);
750 context->SegCs = LOWORD(CS_sig(sigcontext));
751 context->SegDs = LOWORD(DS_sig(sigcontext));
752 context->SegEs = LOWORD(ES_sig(sigcontext));
755 context->SegSs = LOWORD(SS_sig(sigcontext));
759 /***********************************************************************
762 * Restore the signal info from the context.
764 inline static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
766 EAX_sig(sigcontext) = context->Eax;
767 EBX_sig(sigcontext) = context->Ebx;
768 ECX_sig(sigcontext) = context->Ecx;
769 EDX_sig(sigcontext) = context->Edx;
770 ESI_sig(sigcontext) = context->Esi;
771 EDI_sig(sigcontext) = context->Edi;
772 EBP_sig(sigcontext) = context->Ebp;
773 EFL_sig(sigcontext) = context->EFlags;
774 EIP_sig(sigcontext) = context->Eip;
775 ESP_sig(sigcontext) = context->Esp;
776 CS_sig(sigcontext) = context->SegCs;
777 DS_sig(sigcontext) = context->SegDs;
778 ES_sig(sigcontext) = context->SegEs;
779 SS_sig(sigcontext) = context->SegSs;
781 GS_sig(sigcontext) = context->SegGs;
783 wine_set_gs( context->SegGs );
786 FS_sig(sigcontext) = context->SegFs;
788 wine_set_fs( context->SegFs );
793 /***********************************************************************
796 * Setup a proper stack frame for the raise function, and modify the
797 * sigcontext so that the return from the signal handler will call
798 * the raise function.
800 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
804 void *ret_addr; /* return address from raise_func */
805 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
806 CONTEXT *context_ptr; /* second arg for raise_func */
807 void *dummy; /* dummy ret addr for __wine_call_from_32_restore_regs */
809 EXCEPTION_RECORD rec;
816 stack = init_handler( sigcontext, &fs, &gs );
818 /* stack sanity checks */
820 if ((char *)stack >= (char *)get_signal_stack() &&
821 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
823 ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
824 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
825 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
826 server_abort_thread(1);
829 if (stack - 1 > stack || /* check for overflow in subtraction */
830 (char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit + 4096 ||
831 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
833 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit + 4096 - (char *)stack;
836 ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
837 diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
838 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
839 server_abort_thread(1);
841 else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
842 GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
843 NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
846 stack--; /* push the stack_layout structure */
847 stack->ret_addr = __wine_call_from_32_restore_regs;
848 stack->rec_ptr = &stack->rec;
849 stack->context_ptr = &stack->context;
851 stack->rec.ExceptionRecord = NULL;
852 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
853 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
854 stack->rec.NumberParameters = 0;
856 save_context( &stack->context, sigcontext, fs, gs );
858 /* now modify the sigcontext to return to the raise function */
859 ESP_sig(sigcontext) = (DWORD)stack;
860 EIP_sig(sigcontext) = (DWORD)func;
861 EFL_sig(sigcontext) &= ~0x100; /* clear single-step flag */
862 CS_sig(sigcontext) = wine_get_cs();
863 DS_sig(sigcontext) = wine_get_ds();
864 ES_sig(sigcontext) = wine_get_es();
865 FS_sig(sigcontext) = wine_get_fs();
866 GS_sig(sigcontext) = wine_get_gs();
867 SS_sig(sigcontext) = wine_get_ss();
869 return stack->rec_ptr;
873 /***********************************************************************
874 * get_exception_context
876 * Get a pointer to the context built by setup_exception.
878 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
880 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
884 /**********************************************************************
887 * Get the FPU exception code from the FPU status.
889 static inline DWORD get_fpu_code( const CONTEXT *context )
891 DWORD status = context->FloatSave.StatusWord;
893 if (status & 0x01) /* IE */
895 if (status & 0x40) /* SF */
896 return EXCEPTION_FLT_STACK_CHECK;
898 return EXCEPTION_FLT_INVALID_OPERATION;
900 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
901 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
902 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
903 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
904 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
905 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
909 /**********************************************************************
910 * raise_segv_exception
912 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
914 switch(rec->ExceptionCode)
916 case EXCEPTION_ACCESS_VIOLATION:
917 if (rec->NumberParameters == 2)
919 if (!(rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] )))
923 case EXCEPTION_DATATYPE_MISALIGNMENT:
924 /* FIXME: pass through exception handler first? */
925 if (context->EFlags & 0x00040000)
927 /* Disable AC flag, return */
928 context->EFlags &= ~0x00040000;
933 __regs_RtlRaiseException( rec, context );
937 /**********************************************************************
938 * raise_trap_exception
940 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
942 DWORD dr0, dr1, dr2, dr3, dr6, dr7;
944 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
946 if (context->EFlags & 0x100)
948 context->EFlags &= ~0x100; /* clear single-step flag */
950 else /* hardware breakpoint, fetch the debug registers */
952 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
953 NtGetContextThread(GetCurrentThread(), context);
954 /* do we really have a bp from a debug register ?
955 * if not, then someone did a kill(SIGTRAP) on us, and we
956 * shall return a breakpoint, not a single step exception
958 if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
969 __regs_RtlRaiseException( rec, context );
971 if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
972 dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
974 /* the debug registers have changed, set the new values */
975 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
976 NtSetContextThread(GetCurrentThread(), context);
981 /**********************************************************************
982 * raise_fpu_exception
984 static void WINAPI raise_fpu_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
986 __regs_RtlRaiseException( rec, context );
987 restore_fpu( context );
992 /**********************************************************************
993 * raise_vm86_sti_exception
995 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
997 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
998 NtCurrentTeb()->vm86_pending |= VIP_MASK;
1000 if (ntdll_get_thread_data()->vm86_ptr)
1002 if (((char*)context->Eip >= (char*)vm86_return) &&
1003 ((char*)context->Eip <= (char*)vm86_return_end) &&
1004 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1005 /* exiting from VM86, can't throw */
1008 merge_vm86_pending_flags( rec );
1010 else if (NtCurrentTeb()->dpmi_vif &&
1011 !wine_ldt_is_system(context->SegCs) &&
1012 !wine_ldt_is_system(context->SegSs))
1014 /* Executing DPMI code and virtual interrupts are enabled. */
1015 NtCurrentTeb()->vm86_pending = 0;
1016 __regs_RtlRaiseException( rec, context );
1021 /**********************************************************************
1024 * Handler for SIGUSR2.
1025 * We use it to signal that the running __wine_enter_vm86() should
1026 * immediately set VIP_MASK, causing pending events to be handled
1027 * as early as possible.
1029 static HANDLER_DEF(usr2_handler)
1031 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
1032 rec->ExceptionCode = EXCEPTION_VM86_STI;
1034 #endif /* __HAVE_VM86 */
1037 /**********************************************************************
1040 * Handler for SIGSEGV and related errors.
1042 static HANDLER_DEF(segv_handler)
1044 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
1046 switch(get_trap_code(HANDLER_CONTEXT))
1048 case T_OFLOW: /* Overflow exception */
1049 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1051 case T_BOUND: /* Bound range exception */
1052 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1054 case T_PRIVINFLT: /* Invalid opcode exception */
1055 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1057 case T_STKFLT: /* Stack fault */
1058 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1060 case T_SEGNPFLT: /* Segment not present exception */
1061 case T_PROTFLT: /* General protection fault */
1062 case T_UNKNOWN: /* Unknown fault code */
1063 rec->ExceptionCode = get_error_code(HANDLER_CONTEXT) ? EXCEPTION_ACCESS_VIOLATION
1064 : EXCEPTION_PRIV_INSTRUCTION;
1066 case T_PAGEFLT: /* Page fault */
1067 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1068 #ifdef FAULT_ADDRESS
1069 rec->NumberParameters = 2;
1070 rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
1071 rec->ExceptionInformation[1] = (ULONG_PTR)FAULT_ADDRESS;
1074 case T_ALIGNFLT: /* Alignment check exception */
1075 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1078 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1080 case T_NMI: /* NMI interrupt */
1081 case T_DNA: /* Device not available exception */
1082 case T_DOUBLEFLT: /* Double fault exception */
1083 case T_TSSFLT: /* Invalid TSS exception */
1084 case T_RESERVED: /* Unknown exception */
1085 case T_MCHK: /* Machine check exception */
1087 case T_CACHEFLT: /* Cache flush exception */
1089 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1095 /**********************************************************************
1098 * Handler for SIGTRAP.
1100 static HANDLER_DEF(trap_handler)
1102 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
1104 switch(get_trap_code(HANDLER_CONTEXT))
1106 case T_TRCTRAP: /* Single-step exception */
1107 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1109 case T_BPTFLT: /* Breakpoint exception */
1110 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1113 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1119 /**********************************************************************
1122 * Handler for SIGFPE.
1124 static HANDLER_DEF(fpe_handler)
1126 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_fpu_exception );
1129 context = get_exception_context( rec );
1130 save_fpu( context, HANDLER_CONTEXT );
1132 switch(get_trap_code(HANDLER_CONTEXT))
1134 case T_DIVIDE: /* Division by zero exception */
1135 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1137 case T_FPOPFLT: /* Coprocessor segment overrun */
1138 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1140 case T_ARITHTRAP: /* Floating point exception */
1141 case T_UNKNOWN: /* Unknown fault code */
1142 rec->ExceptionCode = get_fpu_code( context );
1145 ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
1146 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1152 /**********************************************************************
1155 * Handler for SIGINT.
1157 * FIXME: should not be calling external functions on the signal stack.
1159 static HANDLER_DEF(int_handler)
1162 init_handler( HANDLER_CONTEXT, &fs, &gs );
1163 if (!dispatch_signal(SIGINT))
1165 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, __regs_RtlRaiseException );
1166 rec->ExceptionCode = CONTROL_C_EXIT;
1170 /**********************************************************************
1173 * Handler for SIGABRT.
1175 static HANDLER_DEF(abrt_handler)
1177 EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, __regs_RtlRaiseException );
1178 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1179 rec->ExceptionFlags = EH_NONCONTINUABLE;
1183 /**********************************************************************
1186 * Handler for SIGTERM.
1188 static HANDLER_DEF(term_handler)
1191 init_handler( HANDLER_CONTEXT, &fs, &gs );
1192 server_abort_thread(0);
1196 /**********************************************************************
1199 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1201 static HANDLER_DEF(usr1_handler)
1206 init_handler( HANDLER_CONTEXT, &fs, &gs );
1207 save_context( &context, HANDLER_CONTEXT, fs, gs );
1208 wait_suspend( &context );
1209 restore_context( &context, HANDLER_CONTEXT );
1213 /**********************************************************************
1214 * get_signal_stack_total_size
1216 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1217 * Must be a power of two.
1219 size_t get_signal_stack_total_size(void)
1221 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
1223 if (!signal_stack_size)
1225 size_t size = 4096, min_size = teb_size + max( MINSIGSTKSZ, 4096 );
1226 /* find the first power of two not smaller than min_size */
1227 while (size < min_size) size *= 2;
1228 signal_stack_mask = size - 1;
1229 signal_stack_size = size - teb_size;
1231 return signal_stack_size + teb_size;
1235 /***********************************************************************
1238 * Set a signal handler
1240 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1242 struct sigaction sig_act;
1245 if (!have_sigaltstack)
1247 struct kernel_sigaction sig_act;
1248 sig_act.ksa_handler = func;
1249 sig_act.ksa_flags = SA_RESTART;
1250 sig_act.ksa_mask = (1 << (SIGINT-1)) |
1251 (1 << (SIGUSR1-1)) |
1253 /* point to the top of the signal stack */
1254 sig_act.ksa_restorer = (char *)get_signal_stack() + signal_stack_size;
1255 return wine_sigaction( sig, &sig_act, NULL );
1258 sig_act.sa_handler = func;
1259 sigemptyset( &sig_act.sa_mask );
1260 sigaddset( &sig_act.sa_mask, SIGINT );
1261 sigaddset( &sig_act.sa_mask, SIGUSR1 );
1262 sigaddset( &sig_act.sa_mask, SIGUSR2 );
1264 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
1265 sig_act.sa_flags = SA_RESTART;
1266 #elif defined (__svr4__) || defined(_SCO_DS) || defined(__APPLE__)
1267 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1269 sig_act.sa_flags = 0;
1273 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1275 return sigaction( sig, &sig_act, NULL );
1279 /***********************************************************************
1280 * __wine_set_signal_handler (NTDLL.@)
1282 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1284 if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1285 if (handlers[sig] != NULL) return -2;
1286 handlers[sig] = wsh;
1291 /**********************************************************************
1294 BOOL SIGNAL_Init(void)
1296 int have_sigaltstack = 0;
1298 #ifdef HAVE_SIGALTSTACK
1299 struct sigaltstack ss;
1300 ss.ss_sp = get_signal_stack();
1301 ss.ss_size = signal_stack_size;
1303 #ifdef __APPLE__ /* work around MacOS bug */
1304 ss.ss_sp = (char *)ss.ss_sp + ss.ss_size;
1306 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1308 /* sigaltstack may fail because the kernel is too old, or
1309 because glibc is brain-dead. In the latter case a
1310 direct system call should succeed. */
1311 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1313 #endif /* HAVE_SIGALTSTACK */
1315 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1316 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1317 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1318 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1319 if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1320 if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1321 if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1323 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1326 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1330 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1336 perror("sigaction");
1342 /**********************************************************************
1343 * __wine_enter_vm86 (NTDLL.@)
1345 * Enter vm86 mode with the specified register context.
1347 void __wine_enter_vm86( CONTEXT *context )
1349 EXCEPTION_RECORD rec;
1351 struct vm86plus_struct vm86;
1353 memset( &vm86, 0, sizeof(vm86) );
1356 restore_vm86_context( context, &vm86 );
1358 ntdll_get_thread_data()->vm86_ptr = &vm86;
1359 merge_vm86_pending_flags( &rec );
1361 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1368 save_vm86_context( context, &vm86 );
1370 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1371 rec.ExceptionRecord = NULL;
1372 rec.ExceptionAddress = (LPVOID)context->Eip;
1373 rec.NumberParameters = 0;
1375 switch(VM86_TYPE(res))
1377 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1378 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1379 raise_segv_exception( &rec, context );
1381 case VM86_TRAP: /* return due to DOS-debugger request */
1382 switch(VM86_ARG(res))
1384 case T_TRCTRAP: /* Single-step exception, single step flag is cleared by raise_trap_exception */
1385 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1387 case T_BPTFLT: /* Breakpoint exception */
1388 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1391 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1394 raise_trap_exception( &rec, context );
1396 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1397 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1398 rec.NumberParameters = 1;
1399 rec.ExceptionInformation[0] = VM86_ARG(res);
1401 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1402 context->EFlags |= VIF_MASK;
1403 context->EFlags &= ~VIP_MASK;
1404 NtCurrentTeb()->vm86_pending = 0;
1405 rec.ExceptionCode = EXCEPTION_VM86_STI;
1407 case VM86_PICRETURN: /* return due to pending PIC request */
1408 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1410 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1412 ERR( "unhandled result from vm86 mode %x\n", res );
1415 __regs_RtlRaiseException( &rec, context );
1419 #else /* __HAVE_VM86 */
1420 /**********************************************************************
1421 * __wine_enter_vm86 (NTDLL.@)
1423 void __wine_enter_vm86( CONTEXT *context )
1425 MESSAGE("vm86 mode not supported on this platform\n");
1427 #endif /* __HAVE_VM86 */
1429 /**********************************************************************
1430 * DbgBreakPoint (NTDLL.@)
1432 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1434 /**********************************************************************
1435 * DbgUserBreakPoint (NTDLL.@)
1437 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1440 /**********************************************************************
1441 * EXC_CallHandler (internal)
1443 * Some exception handlers depend on EBP to have a fixed position relative to
1444 * the exception frame.
1445 * Shrinker depends on (*1) doing what it does,
1446 * (*2) being the exact instruction it is and (*3) beginning with 0x64
1447 * (i.e. the %fs prefix to the movl instruction). It also depends on the
1448 * function calling the handler having only 5 parameters (*4).
1450 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1452 " movl %esp, %ebp\n"
1453 " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1459 " call call_exception_handler\n"
1463 __ASM_GLOBAL_FUNC(call_exception_handler,
1465 " movl %esp, %ebp\n"
1466 " pushl 12(%ebp)\n" /* make any exceptions in this... */
1467 " pushl %edx\n" /* handler be handled by... */
1469 " pushl (0)\n" /* nested_handler (passed in edx). */
1471 " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
1476 " movl 24(%ebp), %ecx\n" /* (*1) */
1477 " call *%ecx\n" /* call handler. (*2) */
1479 " movl (0), %esp\n" /* restore previous... (*3) */
1481 " popl (0)\n" /* exception frame. */
1482 " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
1484 " ret $20\n" /* (*4) */
1486 #endif /* __i386__ */