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"
34 #ifdef HAVE_SYS_PARAM_H
35 # include <sys/param.h>
40 # ifdef HAVE_SYS_SYSCALL_H
41 # include <sys/syscall.h>
45 #ifdef HAVE_SYS_VM86_H
46 # include <sys/vm86.h>
49 #ifdef HAVE_SYS_SIGNAL_H
50 # include <sys/signal.h>
55 #include "wine/library.h"
57 #include "selectors.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;
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), "r" (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), "r" (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, void *__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__ */
294 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) ||\
295 defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
297 #define EAX_sig(context) ((context)->sc_eax)
298 #define EBX_sig(context) ((context)->sc_ebx)
299 #define ECX_sig(context) ((context)->sc_ecx)
300 #define EDX_sig(context) ((context)->sc_edx)
301 #define ESI_sig(context) ((context)->sc_esi)
302 #define EDI_sig(context) ((context)->sc_edi)
303 #define EBP_sig(context) ((context)->sc_ebp)
305 #define CS_sig(context) ((context)->sc_cs)
306 #define DS_sig(context) ((context)->sc_ds)
307 #define ES_sig(context) ((context)->sc_es)
308 #define FS_sig(context) ((context)->sc_fs)
309 #define GS_sig(context) ((context)->sc_gs)
310 #define SS_sig(context) ((context)->sc_ss)
312 #define TRAP_sig(context) ((context)->sc_trapno)
315 #define ERROR_sig(context) ((context)->sc_err)
319 #define CR2_sig(context) ((context)->cr2)
320 #define ERROR_sig(context) ((context)->sc_err)
321 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
325 #define EFL_sig(context) ((context)->sc_efl)
326 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
327 #define CR2_sig(context) ((context)->sc_err)
329 #define EFL_sig(context) ((context)->sc_eflags)
332 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
333 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
335 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
337 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
343 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
344 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
345 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
346 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
347 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
348 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
349 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
351 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
352 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
353 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
354 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
356 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
357 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
359 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
361 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
363 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
365 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
368 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
371 #endif /* svr4 || SCO_DS */
374 /* exception code definitions (already defined by FreeBSD/NetBSD) */
375 #if !defined(__FreeBSD__) && !defined(__NetBSD__) /* FIXME: other BSDs? */
376 #define T_DIVIDE 0 /* Division by zero exception */
377 #define T_TRCTRAP 1 /* Single-step exception */
378 #define T_NMI 2 /* NMI interrupt */
379 #define T_BPTFLT 3 /* Breakpoint exception */
380 #define T_OFLOW 4 /* Overflow exception */
381 #define T_BOUND 5 /* Bound range exception */
382 #define T_PRIVINFLT 6 /* Invalid opcode exception */
383 #define T_DNA 7 /* Device not available exception */
384 #define T_DOUBLEFLT 8 /* Double fault exception */
385 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
386 #define T_TSSFLT 10 /* Invalid TSS exception */
387 #define T_SEGNPFLT 11 /* Segment not present exception */
388 #define T_STKFLT 12 /* Stack fault */
389 #define T_PROTFLT 13 /* General protection fault */
390 #define T_PAGEFLT 14 /* Page fault */
391 #define T_RESERVED 15 /* Unknown exception */
392 #define T_ARITHTRAP 16 /* Floating point exception */
393 #define T_ALIGNFLT 17 /* Alignment check exception */
394 #define T_MCHK 18 /* Machine check exception */
395 #define T_CACHEFLT 19 /* Cache flush exception */
397 #if defined(__NetBSD__)
398 #define T_MCHK 19 /* Machine check exception */
401 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
403 #include "wine/exception.h"
404 #include "stackframe.h"
407 #include "syslevel.h"
408 #include "wine/debug.h"
410 WINE_DEFAULT_DEBUG_CHANNEL(seh);
412 typedef int (*wine_signal_handler)(unsigned int sig);
414 static wine_signal_handler handlers[256];
416 extern void WINAPI EXC_RtlRaiseException( PEXCEPTION_RECORD, PCONTEXT );
418 /***********************************************************************
421 inline static int dispatch_signal(unsigned int sig)
423 if (handlers[sig] == NULL) return 0;
424 return handlers[sig](sig);
428 /***********************************************************************
431 * Get the trap code for a signal.
433 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
436 return TRAP_sig(sigcontext);
438 return T_UNKNOWN; /* unknown trap code */
442 /***********************************************************************
445 * Get the error code for a signal.
447 static inline int get_error_code( const SIGCONTEXT *sigcontext )
450 return ERROR_sig(sigcontext);
456 /***********************************************************************
459 * Get the CR2 value for a signal.
461 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
464 return (void *)CR2_sig(sigcontext);
472 /***********************************************************************
475 * Set the register values from a vm86 structure.
477 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
479 context->Eax = vm86->regs.eax;
480 context->Ebx = vm86->regs.ebx;
481 context->Ecx = vm86->regs.ecx;
482 context->Edx = vm86->regs.edx;
483 context->Esi = vm86->regs.esi;
484 context->Edi = vm86->regs.edi;
485 context->Esp = vm86->regs.esp;
486 context->Ebp = vm86->regs.ebp;
487 context->Eip = vm86->regs.eip;
488 context->SegCs = vm86->regs.cs;
489 context->SegDs = vm86->regs.ds;
490 context->SegEs = vm86->regs.es;
491 context->SegFs = vm86->regs.fs;
492 context->SegGs = vm86->regs.gs;
493 context->SegSs = vm86->regs.ss;
494 context->EFlags = vm86->regs.eflags;
498 /***********************************************************************
499 * restore_vm86_context
501 * Build a vm86 structure from the register values.
503 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
505 vm86->regs.eax = context->Eax;
506 vm86->regs.ebx = context->Ebx;
507 vm86->regs.ecx = context->Ecx;
508 vm86->regs.edx = context->Edx;
509 vm86->regs.esi = context->Esi;
510 vm86->regs.edi = context->Edi;
511 vm86->regs.esp = context->Esp;
512 vm86->regs.ebp = context->Ebp;
513 vm86->regs.eip = context->Eip;
514 vm86->regs.cs = context->SegCs;
515 vm86->regs.ds = context->SegDs;
516 vm86->regs.es = context->SegEs;
517 vm86->regs.fs = context->SegFs;
518 vm86->regs.gs = context->SegGs;
519 vm86->regs.ss = context->SegSs;
520 vm86->regs.eflags = context->EFlags;
522 #endif /* __HAVE_VM86 */
525 /***********************************************************************
528 * Set the register values from a sigcontext.
530 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
532 /* get %fs and %gs at time of the fault */
534 context->SegFs = LOWORD(FS_sig(sigcontext));
536 context->SegFs = wine_get_fs();
539 context->SegGs = LOWORD(GS_sig(sigcontext));
541 context->SegGs = wine_get_gs();
544 /* now restore a proper %fs for the fault handler */
545 if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
546 !IS_SELECTOR_SYSTEM(SS_sig(sigcontext))) /* 16-bit mode */
549 * Win16 or DOS protected mode. Note that during switch
550 * from 16-bit mode to linear mode, CS may be set to system
551 * segment before FS is restored. Fortunately, in this case
552 * SS is still non-system segment. This is why both CS and SS
555 wine_set_fs( SYSLEVEL_Win16CurrentTeb );
556 wine_set_gs( NtCurrentTeb()->gs_sel );
559 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
561 unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
563 /* fetch the saved %fs on the stack */
564 wine_set_fs( stack[0] );
565 wine_set_gs( stack[1] );
566 if (EAX_sig(sigcontext) == VM86_EAX) {
567 /* retrieve pointer to vm86plus struct that was stored in vm86_enter
568 * (but we could also get if from teb->vm86_ptr) */
569 struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
570 /* get context from vm86 struct */
571 save_vm86_context( context, vm86 );
575 #endif /* __HAVE_VM86 */
576 else /* 32-bit mode */
579 wine_set_fs( FS_sig(sigcontext) );
582 wine_set_gs( GS_sig(sigcontext) );
586 context->Eax = EAX_sig(sigcontext);
587 context->Ebx = EBX_sig(sigcontext);
588 context->Ecx = ECX_sig(sigcontext);
589 context->Edx = EDX_sig(sigcontext);
590 context->Esi = ESI_sig(sigcontext);
591 context->Edi = EDI_sig(sigcontext);
592 context->Ebp = EBP_sig(sigcontext);
593 context->EFlags = EFL_sig(sigcontext);
594 context->Eip = EIP_sig(sigcontext);
595 context->Esp = ESP_sig(sigcontext);
596 context->SegCs = LOWORD(CS_sig(sigcontext));
597 context->SegDs = LOWORD(DS_sig(sigcontext));
598 context->SegEs = LOWORD(ES_sig(sigcontext));
599 context->SegSs = LOWORD(SS_sig(sigcontext));
603 /***********************************************************************
606 * Build a sigcontext from the register values.
608 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
611 /* check if exception occurred in vm86 mode */
612 if ((void *)EIP_sig(sigcontext) == vm86_return &&
613 IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) &&
614 EAX_sig(sigcontext) == VM86_EAX)
616 unsigned int *stack = (unsigned int *)ESP_sig(sigcontext);
617 /* retrieve pointer to vm86plus struct that was stored in vm86_enter
618 * (but we could also get it from teb->vm86_ptr) */
619 struct vm86plus_struct *vm86 = (struct vm86plus_struct *)stack[2];
620 restore_vm86_context( context, vm86 );
623 #endif /* __HAVE_VM86 */
625 EAX_sig(sigcontext) = context->Eax;
626 EBX_sig(sigcontext) = context->Ebx;
627 ECX_sig(sigcontext) = context->Ecx;
628 EDX_sig(sigcontext) = context->Edx;
629 ESI_sig(sigcontext) = context->Esi;
630 EDI_sig(sigcontext) = context->Edi;
631 EBP_sig(sigcontext) = context->Ebp;
632 EFL_sig(sigcontext) = context->EFlags;
633 EIP_sig(sigcontext) = context->Eip;
634 ESP_sig(sigcontext) = context->Esp;
635 CS_sig(sigcontext) = context->SegCs;
636 DS_sig(sigcontext) = context->SegDs;
637 ES_sig(sigcontext) = context->SegEs;
638 SS_sig(sigcontext) = context->SegSs;
640 FS_sig(sigcontext) = context->SegFs;
642 wine_set_fs( context->SegFs );
645 GS_sig(sigcontext) = context->SegGs;
647 wine_set_gs( context->SegGs );
652 /***********************************************************************
655 * Handler initialization when the full context is not needed.
657 static void init_handler( const SIGCONTEXT *sigcontext )
659 /* restore a proper %fs for the fault handler */
660 if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext)) ||
661 !IS_SELECTOR_SYSTEM(SS_sig(sigcontext))) /* 16-bit mode */
663 wine_set_fs( SYSLEVEL_Win16CurrentTeb );
664 wine_set_gs( NtCurrentTeb()->gs_sel );
667 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
669 /* fetch the saved %fs on the stack */
670 wine_set_fs( *(unsigned int *)ESP_sig(sigcontext) );
671 wine_set_gs( NtCurrentTeb()->gs_sel );
673 #endif /* __HAVE_VM86 */
674 else /* 32-bit mode, get %fs at time of the fault */
677 wine_set_fs( FS_sig(sigcontext) );
680 wine_set_gs( GS_sig(sigcontext) );
686 /***********************************************************************
689 * Set the FPU context from a sigcontext.
691 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
694 if (FPU_sig(sigcontext))
696 context->FloatSave = *FPU_sig(sigcontext);
701 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
702 #endif /* __GNUC__ */
706 /***********************************************************************
709 * Restore the FPU context to a sigcontext.
711 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
713 /* reset the current interrupt status */
714 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
716 if (FPU_sig(sigcontext))
718 *FPU_sig(sigcontext) = context->FloatSave;
723 /* avoid nested exceptions */
724 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
725 #endif /* __GNUC__ */
729 /**********************************************************************
732 * Get the FPU exception code from the FPU status.
734 static inline DWORD get_fpu_code( const CONTEXT *context )
736 DWORD status = context->FloatSave.StatusWord;
738 if (status & 0x01) /* IE */
740 if (status & 0x40) /* SF */
741 return EXCEPTION_FLT_STACK_CHECK;
743 return EXCEPTION_FLT_INVALID_OPERATION;
745 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
746 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
747 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
748 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
749 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
750 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
754 /**********************************************************************
757 * Implementation of SIGSEGV handler.
759 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
761 EXCEPTION_RECORD rec;
762 DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
765 /* we want the page-fault case to be fast */
766 if (trap_code == T_PAGEFLT)
767 if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
770 rec.ExceptionRecord = NULL;
771 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
772 rec.ExceptionAddress = (LPVOID)context->Eip;
773 rec.NumberParameters = 0;
777 case T_OFLOW: /* Overflow exception */
778 rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
780 case T_BOUND: /* Bound range exception */
781 rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
783 case T_PRIVINFLT: /* Invalid opcode exception */
784 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
786 case T_STKFLT: /* Stack fault */
787 rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
789 case T_SEGNPFLT: /* Segment not present exception */
790 case T_PROTFLT: /* General protection fault */
791 case T_UNKNOWN: /* Unknown fault code */
792 if (INSTR_EmulateInstruction( context )) return;
793 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
795 case T_PAGEFLT: /* Page fault */
797 rec.NumberParameters = 2;
798 rec.ExceptionInformation[0] = (err_code & 2) != 0;
799 rec.ExceptionInformation[1] = (DWORD)cr2;
801 rec.ExceptionCode = page_fault_code;
803 case T_ALIGNFLT: /* Alignment check exception */
804 /* FIXME: pass through exception handler first? */
805 if (context->EFlags & 0x00040000)
807 /* Disable AC flag, return */
808 context->EFlags &= ~0x00040000;
811 rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
814 ERR( "Got unexpected trap %d\n", trap_code );
816 case T_NMI: /* NMI interrupt */
817 case T_DNA: /* Device not available exception */
818 case T_DOUBLEFLT: /* Double fault exception */
819 case T_TSSFLT: /* Invalid TSS exception */
820 case T_RESERVED: /* Unknown exception */
821 case T_MCHK: /* Machine check exception */
823 case T_CACHEFLT: /* Cache flush exception */
825 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
828 EXC_RtlRaiseException( &rec, context );
832 /**********************************************************************
835 * Implementation of SIGTRAP handler.
837 static void do_trap( CONTEXT *context, int trap_code )
839 EXCEPTION_RECORD rec;
840 DWORD dr0, dr1, dr2, dr3, dr6, dr7;
842 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
843 rec.ExceptionRecord = NULL;
844 rec.ExceptionAddress = (LPVOID)context->Eip;
845 rec.NumberParameters = 0;
849 case T_TRCTRAP: /* Single-step exception */
850 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
851 if (context->EFlags & 0x100)
853 context->EFlags &= ~0x100; /* clear single-step flag */
855 else /* hardware breakpoint, fetch the debug registers */
857 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
858 GetThreadContext(GetCurrentThread(), context);
861 case T_BPTFLT: /* Breakpoint exception */
862 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
865 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
875 EXC_RtlRaiseException( &rec, context );
877 if (dr0 != context->Dr0 || dr1 != context->Dr1 || dr2 != context->Dr2 ||
878 dr3 != context->Dr3 || dr6 != context->Dr6 || dr7 != context->Dr7)
880 /* the debug registers have changed, set the new values */
881 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
882 SetThreadContext(GetCurrentThread(), context);
887 /**********************************************************************
890 * Implementation of SIGFPE handler
892 static void do_fpe( CONTEXT *context, int trap_code )
894 EXCEPTION_RECORD rec;
898 case T_DIVIDE: /* Division by zero exception */
899 rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
901 case T_FPOPFLT: /* Coprocessor segment overrun */
902 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
904 case T_ARITHTRAP: /* Floating point exception */
905 case T_UNKNOWN: /* Unknown fault code */
906 rec.ExceptionCode = get_fpu_code( context );
909 ERR( "Got unexpected trap %d\n", trap_code );
910 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
913 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
914 rec.ExceptionRecord = NULL;
915 rec.ExceptionAddress = (LPVOID)context->Eip;
916 rec.NumberParameters = 0;
917 EXC_RtlRaiseException( &rec, context );
922 /**********************************************************************
925 * Handler for SIGUSR2, which we use to set the vm86 pending flag.
927 static void set_vm86_pend( CONTEXT *context )
929 EXCEPTION_RECORD rec;
930 TEB *teb = NtCurrentTeb();
931 struct vm86plus_struct *vm86 = (struct vm86plus_struct*)(teb->vm86_ptr);
933 rec.ExceptionCode = EXCEPTION_VM86_STI;
934 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
935 rec.ExceptionRecord = NULL;
936 rec.NumberParameters = 1;
937 rec.ExceptionInformation[0] = 0;
939 /* __wine_enter_vm86() merges the vm86_pending flag in safely */
940 teb->vm86_pending |= VIP_MASK;
941 /* see if we were in VM86 mode */
942 if (context->EFlags & 0x00020000)
944 /* seems so, also set flag in signal context */
945 if (context->EFlags & VIP_MASK) return;
946 context->EFlags |= VIP_MASK;
947 vm86->regs.eflags |= VIP_MASK; /* no exception recursion */
948 if (context->EFlags & VIF_MASK) {
949 /* VIF is set, throw exception */
950 teb->vm86_pending = 0;
951 teb->vm86_ptr = NULL;
952 rec.ExceptionAddress = (LPVOID)context->Eip;
953 EXC_RtlRaiseException( &rec, context );
954 teb->vm86_ptr = vm86;
959 /* not in VM86, but possibly setting up for it */
960 if (vm86->regs.eflags & VIP_MASK) return;
961 vm86->regs.eflags |= VIP_MASK;
962 if (((char*)context->Eip >= (char*)vm86_return) &&
963 ((char*)context->Eip <= (char*)vm86_return_end) &&
964 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
965 /* exiting from VM86, can't throw */
968 if (vm86->regs.eflags & VIF_MASK) {
969 /* VIF is set, throw exception */
971 teb->vm86_pending = 0;
972 teb->vm86_ptr = NULL;
973 save_vm86_context( &vcontext, vm86 );
974 rec.ExceptionAddress = (LPVOID)vcontext.Eip;
975 EXC_RtlRaiseException( &rec, &vcontext );
976 teb->vm86_ptr = vm86;
977 restore_vm86_context( &vcontext, vm86 );
983 /**********************************************************************
986 * Handler for SIGUSR2.
987 * We use it to signal that the running __wine_enter_vm86() should
988 * immediately set VIP_MASK, causing pending events to be handled
989 * as early as possible.
991 static HANDLER_DEF(usr2_handler)
995 save_context( &context, HANDLER_CONTEXT );
996 set_vm86_pend( &context );
997 restore_context( &context, HANDLER_CONTEXT );
1001 /**********************************************************************
1004 * Handler for SIGALRM.
1005 * Increases the alarm counter and sets the vm86 pending flag.
1007 static HANDLER_DEF(alrm_handler)
1011 save_context( &context, HANDLER_CONTEXT );
1012 NtCurrentTeb()->alarms++;
1013 set_vm86_pend( &context );
1014 restore_context( &context, HANDLER_CONTEXT );
1016 #endif /* __HAVE_VM86 */
1019 /**********************************************************************
1022 * Handler for SIGSEGV and related errors.
1024 static HANDLER_DEF(segv_handler)
1027 save_context( &context, HANDLER_CONTEXT );
1028 do_segv( &context, get_trap_code(HANDLER_CONTEXT),
1029 get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
1030 restore_context( &context, HANDLER_CONTEXT );
1034 /**********************************************************************
1037 * Handler for SIGTRAP.
1039 static HANDLER_DEF(trap_handler)
1042 save_context( &context, HANDLER_CONTEXT );
1043 do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
1044 restore_context( &context, HANDLER_CONTEXT );
1048 /**********************************************************************
1051 * Handler for SIGFPE.
1053 static HANDLER_DEF(fpe_handler)
1056 save_fpu( &context, HANDLER_CONTEXT );
1057 save_context( &context, HANDLER_CONTEXT );
1058 do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
1059 restore_context( &context, HANDLER_CONTEXT );
1060 restore_fpu( &context, HANDLER_CONTEXT );
1064 /**********************************************************************
1067 * Handler for SIGINT.
1069 static HANDLER_DEF(int_handler)
1071 init_handler( HANDLER_CONTEXT );
1072 if (!dispatch_signal(SIGINT))
1074 EXCEPTION_RECORD rec;
1077 save_context( &context, HANDLER_CONTEXT );
1078 rec.ExceptionCode = CONTROL_C_EXIT;
1079 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1080 rec.ExceptionRecord = NULL;
1081 rec.ExceptionAddress = (LPVOID)context.Eip;
1082 rec.NumberParameters = 0;
1083 EXC_RtlRaiseException( &rec, &context );
1084 restore_context( &context, HANDLER_CONTEXT );
1088 /**********************************************************************
1091 * Handler for SIGABRT.
1093 static HANDLER_DEF(abrt_handler)
1095 EXCEPTION_RECORD rec;
1098 save_context( &context, HANDLER_CONTEXT );
1099 rec.ExceptionCode = EXCEPTION_WINE_ASSERTION;
1100 rec.ExceptionFlags = EH_NONCONTINUABLE;
1101 rec.ExceptionRecord = NULL;
1102 rec.ExceptionAddress = (LPVOID)context.Eip;
1103 rec.NumberParameters = 0;
1104 EXC_RtlRaiseException( &rec, &context ); /* Should never return.. */
1105 restore_context( &context, HANDLER_CONTEXT );
1109 /**********************************************************************
1112 * Handler for SIGTERM.
1114 static HANDLER_DEF(term_handler)
1116 init_handler( HANDLER_CONTEXT );
1117 SYSDEPS_AbortThread(0);
1121 /**********************************************************************
1124 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1126 static HANDLER_DEF(usr1_handler)
1128 init_handler( HANDLER_CONTEXT );
1129 /* wait with 0 timeout, will only return once the thread is no longer suspended */
1130 WaitForMultipleObjectsEx( 0, NULL, FALSE, 0, FALSE );
1134 /***********************************************************************
1137 * Set a signal handler
1139 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
1141 struct sigaction sig_act;
1144 if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
1146 struct kernel_sigaction sig_act;
1147 sig_act.ksa_handler = func;
1148 sig_act.ksa_flags = SA_RESTART;
1149 sig_act.ksa_mask = (1 << (SIGINT-1)) |
1150 (1 << (SIGUSR2-1)) |
1152 /* point to the top of the stack */
1153 sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
1154 return wine_sigaction( sig, &sig_act, NULL );
1157 sig_act.sa_handler = func;
1158 sigemptyset( &sig_act.sa_mask );
1159 sigaddset( &sig_act.sa_mask, SIGINT );
1160 sigaddset( &sig_act.sa_mask, SIGUSR2 );
1161 sigaddset( &sig_act.sa_mask, SIGALRM );
1164 sig_act.sa_flags = SA_RESTART;
1165 #elif defined (__svr4__) || defined(_SCO_DS)
1166 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1168 sig_act.sa_flags = 0;
1172 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
1174 return sigaction( sig, &sig_act, NULL );
1178 /***********************************************************************
1179 * __wine_set_signal_handler (NTDLL.@)
1181 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1183 if (sig > sizeof(handlers) / sizeof(handlers[0])) return -1;
1184 if (handlers[sig] != NULL) return -2;
1185 handlers[sig] = wsh;
1190 /**********************************************************************
1193 BOOL SIGNAL_Init(void)
1195 int have_sigaltstack = 0;
1197 #ifdef HAVE_SIGALTSTACK
1198 struct sigaltstack ss;
1199 if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
1201 ss.ss_size = SIGNAL_STACK_SIZE;
1203 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1205 /* sigaltstack may fail because the kernel is too old, or
1206 because glibc is brain-dead. In the latter case a
1207 direct system call should succeed. */
1208 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
1211 #endif /* HAVE_SIGALTSTACK */
1213 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
1214 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
1215 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1216 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1217 if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
1218 if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
1219 if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
1221 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
1224 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
1228 if (set_handler( SIGALRM, have_sigaltstack, (void (*)())alrm_handler ) == -1) goto error;
1229 if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
1235 perror("sigaction");
1240 /**********************************************************************
1243 * Block the async signals.
1245 void SIGNAL_Block(void)
1249 sigemptyset( &block_set );
1250 sigaddset( &block_set, SIGALRM );
1251 sigaddset( &block_set, SIGIO );
1252 sigaddset( &block_set, SIGHUP );
1253 sigaddset( &block_set, SIGUSR1 );
1254 sigaddset( &block_set, SIGUSR2 );
1255 sigprocmask( SIG_BLOCK, &block_set, NULL );
1259 /***********************************************************************
1262 * Unblock signals. Called from EXC_RtlRaiseException.
1264 void SIGNAL_Unblock(void)
1268 sigfillset( &all_sigs );
1269 sigprocmask( SIG_UNBLOCK, &all_sigs, NULL );
1273 /**********************************************************************
1276 * Restore the default handlers.
1278 void SIGNAL_Reset(void)
1280 signal( SIGINT, SIG_DFL );
1281 signal( SIGFPE, SIG_DFL );
1282 signal( SIGSEGV, SIG_DFL );
1283 signal( SIGILL, SIG_DFL );
1284 signal( SIGABRT, SIG_DFL );
1285 signal( SIGTERM, SIG_DFL );
1287 signal( SIGBUS, SIG_DFL );
1290 signal( SIGTRAP, SIG_DFL );
1296 /**********************************************************************
1297 * __wine_enter_vm86 (NTDLL.@)
1299 * Enter vm86 mode with the specified register context.
1301 void __wine_enter_vm86( CONTEXT *context )
1303 EXCEPTION_RECORD rec;
1304 TEB *teb = NtCurrentTeb();
1306 struct vm86plus_struct vm86;
1308 memset( &vm86, 0, sizeof(vm86) );
1311 restore_vm86_context( context, &vm86 );
1312 /* Linux doesn't preserve pending flag (VIP_MASK) on return,
1313 * so save it on entry, just in case */
1314 teb->vm86_pending |= (context->EFlags & VIP_MASK);
1315 /* Work around race conditions with signal handler
1316 * (avoiding sigprocmask for performance reasons) */
1317 teb->vm86_ptr = &vm86;
1318 vm86.regs.eflags |= teb->vm86_pending;
1319 /* Check for VIF|VIP here, since vm86_enter doesn't */
1320 if ((vm86.regs.eflags & (VIF_MASK|VIP_MASK)) == (VIF_MASK|VIP_MASK)) {
1321 teb->vm86_ptr = NULL;
1322 teb->vm86_pending = 0;
1323 context->EFlags |= VIP_MASK;
1324 rec.ExceptionCode = EXCEPTION_VM86_STI;
1325 rec.ExceptionInformation[0] = 0;
1331 res = vm86_enter( &teb->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1337 } while (VM86_TYPE(res) == VM86_SIGNAL);
1339 save_vm86_context( context, &vm86 );
1340 context->EFlags |= teb->vm86_pending;
1342 switch(VM86_TYPE(res))
1344 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1345 do_segv( context, T_PROTFLT, 0, 0 );
1347 case VM86_TRAP: /* return due to DOS-debugger request */
1348 do_trap( context, VM86_ARG(res) );
1350 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1351 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1353 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1354 teb->vm86_pending = 0;
1355 rec.ExceptionCode = EXCEPTION_VM86_STI;
1357 case VM86_PICRETURN: /* return due to pending PIC request */
1358 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1361 ERR( "unhandled result from vm86 mode %x\n", res );
1364 rec.ExceptionInformation[0] = VM86_ARG(res);
1366 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1367 rec.ExceptionRecord = NULL;
1368 rec.ExceptionAddress = (LPVOID)context->Eip;
1369 rec.NumberParameters = 1;
1370 EXC_RtlRaiseException( &rec, context );
1374 #else /* __HAVE_VM86 */
1375 /**********************************************************************
1376 * __wine_enter_vm86 (NTDLL.@)
1378 void __wine_enter_vm86( CONTEXT *context )
1380 MESSAGE("vm86 mode not supported on this platform\n");
1382 #endif /* __HAVE_VM86 */
1384 /**********************************************************************
1385 * DbgBreakPoint (NTDLL.@)
1387 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1389 /**********************************************************************
1390 * DbgUserBreakPoint (NTDLL.@)
1392 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1394 #endif /* __i386__ */