2 * i386 signal handling routines
4 * Copyright 1999 Alexandre Julliard
17 #ifdef HAVE_SYS_PARAM_H
18 # include <sys/param.h>
23 # ifdef HAVE_SYS_SYSCALL_H
24 # include <sys/syscall.h>
28 #ifdef HAVE_SYS_VM86_H
29 # include <sys/vm86.h>
33 #include "selectors.h"
35 /***********************************************************************
36 * signal context platform-specific definitions
42 unsigned short sc_gs, __gsh;
43 unsigned short sc_fs, __fsh;
44 unsigned short sc_es, __esh;
45 unsigned short sc_ds, __dsh;
54 unsigned long sc_trapno;
57 unsigned short sc_cs, __csh;
58 unsigned long sc_eflags;
59 unsigned long esp_at_signal;
60 unsigned short sc_ss, __ssh;
62 unsigned long oldmask;
66 #define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
67 #define HANDLER_CONTEXT (&__context)
69 /* this is the sigaction structure from the Linux 2.1.20 kernel. */
70 struct kernel_sigaction
72 void (*ksa_handler)();
73 unsigned long ksa_mask;
74 unsigned long ksa_flags;
78 /* Similar to the sigaction function in libc, except it leaves alone the
79 restorer field, which is used to specify the signal stack address */
80 static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
81 struct kernel_sigaction *old )
83 __asm__ __volatile__( "pushl %%ebx\n\t"
88 : "0" (SYS_sigaction), "r" (sig), "c" (new), "d" (old) );
94 #ifdef HAVE_SIGALTSTACK
95 /* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
96 static inline int wine_sigaltstack( const struct sigaltstack *new,
97 struct sigaltstack *old )
100 __asm__ __volatile__( "pushl %%ebx\n\t"
105 : "0" (SYS_sigaltstack), "r" (new), "c" (old) );
106 if (ret >= 0) return 0;
112 int vm86_enter( struct vm86plus_struct *ptr );
114 __ASM_GLOBAL_FUNC(vm86_enter,
116 "movl %esp, %ebp\n\t"
117 "movl $166,%eax\n\t" /*SYS_vm86*/
119 "movl 8(%ebp),%ecx\n\t"
121 "movl $1,%ebx\n\t" /*VM86_ENTER*/
122 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
124 ".globl " __ASM_NAME("vm86_return") "\n\t"
125 ".type " __ASM_NAME("vm86_return") ",@function\n"
126 __ASM_NAME("vm86_return") ":\n\t"
137 #define EAX_sig(context) ((context)->tf_eax)
138 #define EBX_sig(context) ((context)->tf_ebx)
139 #define ECX_sig(context) ((context)->tf_ecx)
140 #define EDX_sig(context) ((context)->tf_edx)
141 #define ESI_sig(context) ((context)->tf_esi)
142 #define EDI_sig(context) ((context)->tf_edi)
143 #define EBP_sig(context) ((context)->tf_ebp)
145 #define CS_sig(context) ((context)->tf_cs)
146 #define DS_sig(context) ((context)->tf_ds)
147 #define ES_sig(context) ((context)->tf_es)
148 #define SS_sig(context) ((context)->tf_ss)
150 #include <machine/frame.h>
151 typedef struct trapframe SIGCONTEXT;
153 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
154 #define HANDLER_CONTEXT __context
156 #define EFL_sig(context) ((context)->tf_eflags)
158 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
159 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
163 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
165 typedef struct sigcontext SIGCONTEXT;
167 #define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
168 #define HANDLER_CONTEXT __context
172 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
175 #include <sys/regset.h>
179 #include <sys/ucontext.h>
181 typedef struct ucontext SIGCONTEXT;
183 #define HANDLER_DEF(name) void name( int __signal, void *__siginfo, SIGCONTEXT *__context )
184 #define HANDLER_CONTEXT __context
186 #endif /* svr4 || SCO_DS */
192 unsigned long ContextFlags;
193 FLOATING_SAVE_AREA sc_float;
198 unsigned long sc_edi;
199 unsigned long sc_esi;
200 unsigned long sc_eax;
201 unsigned long sc_ebx;
202 unsigned long sc_ecx;
203 unsigned long sc_edx;
204 unsigned long sc_ebp;
205 unsigned long sc_eip;
207 unsigned long sc_eflags;
208 unsigned long sc_esp;
215 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__EMX__)
217 #define EAX_sig(context) ((context)->sc_eax)
218 #define EBX_sig(context) ((context)->sc_ebx)
219 #define ECX_sig(context) ((context)->sc_ecx)
220 #define EDX_sig(context) ((context)->sc_edx)
221 #define ESI_sig(context) ((context)->sc_esi)
222 #define EDI_sig(context) ((context)->sc_edi)
223 #define EBP_sig(context) ((context)->sc_ebp)
225 #define CS_sig(context) ((context)->sc_cs)
226 #define DS_sig(context) ((context)->sc_ds)
227 #define ES_sig(context) ((context)->sc_es)
228 #define SS_sig(context) ((context)->sc_ss)
230 /* FS and GS are now in the sigcontext struct of FreeBSD, but not
231 * saved by the exception handling. duh.
232 * Actually they are in -current (have been for a while), and that
233 * patch now finally has been MFC'd to -stable too (Nov 15 1999).
234 * If you're running a system from the -stable branch older than that,
235 * like a 3.3-RELEASE, grab the patch from the ports tree:
236 * ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/ports/emulators/wine/files/patch-3.3-sys-fsgs
237 * (If its not yet there when you look, go here:
238 * http://www.jelal.kn-bremen.de/freebsd/ports/emulators/wine/files/ )
241 #define FS_sig(context) ((context)->sc_fs)
242 #define GS_sig(context) ((context)->sc_gs)
246 #define FS_sig(context) ((context)->sc_fs)
247 #define GS_sig(context) ((context)->sc_gs)
248 #define CR2_sig(context) ((context)->cr2)
249 #define TRAP_sig(context) ((context)->sc_trapno)
250 #define ERROR_sig(context) ((context)->sc_err)
251 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
255 #define EFL_sig(context) ((context)->sc_eflags)
257 #define EFL_sig(context) ((context)->sc_efl)
258 /* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
259 #define CR2_sig(context) ((context)->sc_err)
260 #define TRAP_sig(context) ((context)->sc_trapno)
263 #define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
264 #define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
266 #endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
268 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
274 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
275 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
276 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
277 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
278 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
279 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
280 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
282 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
283 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
284 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
285 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
287 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
288 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
290 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
292 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
294 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
296 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
299 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
302 #endif /* svr4 || SCO_DS */
305 /* exception code definitions (already defined by FreeBSD) */
306 #ifndef __FreeBSD__ /* FIXME: other BSDs? */
307 #define T_DIVIDE 0 /* Division by zero exception */
308 #define T_TRCTRAP 1 /* Single-step exception */
309 #define T_NMI 2 /* NMI interrupt */
310 #define T_BPTFLT 3 /* Breakpoint exception */
311 #define T_OFLOW 4 /* Overflow exception */
312 #define T_BOUND 5 /* Bound range exception */
313 #define T_PRIVINFLT 6 /* Invalid opcode exception */
314 #define T_DNA 7 /* Device not available exception */
315 #define T_DOUBLEFLT 8 /* Double fault exception */
316 #define T_FPOPFLT 9 /* Coprocessor segment overrun */
317 #define T_TSSFLT 10 /* Invalid TSS exception */
318 #define T_SEGNPFLT 11 /* Segment not present exception */
319 #define T_STKFLT 12 /* Stack fault */
320 #define T_PROTFLT 13 /* General protection fault */
321 #define T_PAGEFLT 14 /* Page fault */
322 #define T_RESERVED 15 /* Unknown exception */
323 #define T_ARITHTRAP 16 /* Floating point exception */
324 #define T_ALIGNFLT 17 /* Alignment check exception */
325 #define T_MCHK 18 /* Machine check exception */
326 #define T_CACHEFLT 19 /* Cache flush exception */
329 #define T_UNKNOWN (-1) /* Unknown fault (TRAP_sig not defined) */
331 #include "wine/exception.h"
333 #include "stackframe.h"
337 #include "syslevel.h"
338 #include "debugtools.h"
340 DEFAULT_DEBUG_CHANNEL(seh);
343 /***********************************************************************
346 * Get the trap code for a signal.
348 static inline int get_trap_code( const SIGCONTEXT *sigcontext )
351 return TRAP_sig(sigcontext);
353 return T_UNKNOWN; /* unknown trap code */
357 /***********************************************************************
360 * Get the error code for a signal.
362 static inline int get_error_code( const SIGCONTEXT *sigcontext )
365 return ERROR_sig(sigcontext);
371 /***********************************************************************
374 * Get the CR2 value for a signal.
376 static inline void *get_cr2_value( const SIGCONTEXT *sigcontext )
379 return (void *)CR2_sig(sigcontext);
385 /***********************************************************************
388 * Set the register values from a sigcontext.
390 static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext )
393 /* get %fs at time of the fault */
395 fs = FS_sig(sigcontext);
401 /* now restore a proper %fs for the fault handler */
402 if (!IS_SELECTOR_SYSTEM(CS_sig(sigcontext))) /* 16-bit mode */
404 fs = SYSLEVEL_Win16CurrentTeb;
407 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
409 /* retrieve pointer to vm86plus struct that was stored in vm86_enter */
410 struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)ESP_sig(sigcontext);
411 /* fetch the saved %fs on the stack */
412 fs = *((unsigned int *)ESP_sig(sigcontext) + 2);
414 /* get context from vm86 struct */
415 context->Eax = vm86->regs.eax;
416 context->Ebx = vm86->regs.ebx;
417 context->Ecx = vm86->regs.ecx;
418 context->Edx = vm86->regs.edx;
419 context->Esi = vm86->regs.esi;
420 context->Edi = vm86->regs.edi;
421 context->Esp = vm86->regs.esp;
422 context->Ebp = vm86->regs.ebp;
423 context->Eip = vm86->regs.eip;
424 context->SegCs = vm86->regs.cs;
425 context->SegDs = vm86->regs.ds;
426 context->SegEs = vm86->regs.es;
427 context->SegFs = vm86->regs.fs;
428 context->SegGs = vm86->regs.gs;
429 context->SegSs = vm86->regs.ss;
430 context->EFlags = vm86->regs.eflags;
437 context->Eax = EAX_sig(sigcontext);
438 context->Ebx = EBX_sig(sigcontext);
439 context->Ecx = ECX_sig(sigcontext);
440 context->Edx = EDX_sig(sigcontext);
441 context->Esi = ESI_sig(sigcontext);
442 context->Edi = EDI_sig(sigcontext);
443 context->Ebp = EBP_sig(sigcontext);
444 context->EFlags = EFL_sig(sigcontext);
445 context->Eip = EIP_sig(sigcontext);
446 context->Esp = ESP_sig(sigcontext);
447 context->SegCs = LOWORD(CS_sig(sigcontext));
448 context->SegDs = LOWORD(DS_sig(sigcontext));
449 context->SegEs = LOWORD(ES_sig(sigcontext));
450 context->SegSs = LOWORD(SS_sig(sigcontext));
452 context->SegGs = LOWORD(GS_sig(sigcontext));
454 context->SegGs = __get_gs();
459 /***********************************************************************
462 * Build a sigcontext from the register values.
464 static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
467 /* check if exception occurred in vm86 mode */
468 if ((void *)EIP_sig(sigcontext) == vm86_return &&
469 IS_SELECTOR_SYSTEM(CS_sig(sigcontext)))
471 /* retrieve pointer to vm86plus struct that was stored in vm86_enter */
472 struct vm86plus_struct *vm86 = *(struct vm86plus_struct **)ESP_sig(sigcontext);
473 vm86->regs.eax = context->Eax;
474 vm86->regs.ebx = context->Ebx;
475 vm86->regs.ecx = context->Ecx;
476 vm86->regs.edx = context->Edx;
477 vm86->regs.esi = context->Esi;
478 vm86->regs.edi = context->Edi;
479 vm86->regs.esp = context->Esp;
480 vm86->regs.ebp = context->Ebp;
481 vm86->regs.eip = context->Eip;
482 vm86->regs.cs = context->SegCs;
483 vm86->regs.ds = context->SegDs;
484 vm86->regs.es = context->SegEs;
485 vm86->regs.fs = context->SegFs;
486 vm86->regs.gs = context->SegGs;
487 vm86->regs.ss = context->SegSs;
488 vm86->regs.eflags = context->EFlags;
493 EAX_sig(sigcontext) = context->Eax;
494 EBX_sig(sigcontext) = context->Ebx;
495 ECX_sig(sigcontext) = context->Ecx;
496 EDX_sig(sigcontext) = context->Edx;
497 ESI_sig(sigcontext) = context->Esi;
498 EDI_sig(sigcontext) = context->Edi;
499 EBP_sig(sigcontext) = context->Ebp;
500 EFL_sig(sigcontext) = context->EFlags;
501 EIP_sig(sigcontext) = context->Eip;
502 ESP_sig(sigcontext) = context->Esp;
503 CS_sig(sigcontext) = context->SegCs;
504 DS_sig(sigcontext) = context->SegDs;
505 ES_sig(sigcontext) = context->SegEs;
506 SS_sig(sigcontext) = context->SegSs;
508 FS_sig(sigcontext) = context->SegFs;
510 __set_fs( context->SegFs );
513 GS_sig(sigcontext) = context->SegGs;
515 __set_gs( context->SegGs );
520 /***********************************************************************
523 * Set the FPU context from a sigcontext.
525 inline static void save_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
528 if (FPU_sig(sigcontext))
530 context->FloatSave = *FPU_sig(sigcontext);
535 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
536 #endif /* __GNUC__ */
540 /***********************************************************************
543 * Restore the FPU context to a sigcontext.
545 inline static void restore_fpu( CONTEXT *context, const SIGCONTEXT *sigcontext )
547 /* reset the current interrupt status */
548 context->FloatSave.StatusWord &= context->FloatSave.ControlWord | 0xffffff80;
550 if (FPU_sig(sigcontext))
552 *FPU_sig(sigcontext) = context->FloatSave;
557 /* avoid nested exceptions */
558 __asm__ __volatile__( "frstor %0; fwait" : : "m" (context->FloatSave) );
559 #endif /* __GNUC__ */
563 /**********************************************************************
566 * Get the FPU exception code from the FPU status.
568 static inline DWORD get_fpu_code( const CONTEXT *context )
570 DWORD status = context->FloatSave.StatusWord;
572 if (status & 0x01) /* IE */
574 if (status & 0x40) /* SF */
575 return EXCEPTION_FLT_STACK_CHECK;
577 return EXCEPTION_FLT_INVALID_OPERATION;
579 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
580 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
581 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
582 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
583 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
584 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
588 /**********************************************************************
591 * Implementation of SIGSEGV handler.
593 static void do_segv( CONTEXT *context, int trap_code, void *cr2, int err_code )
595 EXCEPTION_RECORD rec;
596 DWORD page_fault_code = EXCEPTION_ACCESS_VIOLATION;
599 /* we want the page-fault case to be fast */
600 if (trap_code == T_PAGEFLT)
601 if (!(page_fault_code = VIRTUAL_HandleFault( cr2 ))) return;
604 rec.ExceptionRecord = NULL;
605 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
606 rec.ExceptionAddress = (LPVOID)context->Eip;
607 rec.NumberParameters = 0;
611 case T_OFLOW: /* Overflow exception */
612 rec.ExceptionCode = EXCEPTION_INT_OVERFLOW;
614 case T_BOUND: /* Bound range exception */
615 rec.ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
617 case T_PRIVINFLT: /* Invalid opcode exception */
618 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
620 case T_STKFLT: /* Stack fault */
621 rec.ExceptionCode = EXCEPTION_STACK_OVERFLOW;
623 case T_SEGNPFLT: /* Segment not present exception */
624 case T_PROTFLT: /* General protection fault */
625 case T_UNKNOWN: /* Unknown fault code */
626 if (INSTR_EmulateInstruction( context )) return;
627 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
629 case T_PAGEFLT: /* Page fault */
631 rec.NumberParameters = 2;
632 rec.ExceptionInformation[0] = (err_code & 2) != 0;
633 rec.ExceptionInformation[1] = (DWORD)cr2;
635 rec.ExceptionCode = page_fault_code;
637 case T_ALIGNFLT: /* Alignment check exception */
638 /* FIXME: pass through exception handler first? */
639 if (context->EFlags & 0x00040000)
641 /* Disable AC flag, return */
642 context->EFlags &= ~0x00040000;
645 rec.ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
648 ERR( "Got unexpected trap %d\n", trap_code );
650 case T_NMI: /* NMI interrupt */
651 case T_DNA: /* Device not available exception */
652 case T_DOUBLEFLT: /* Double fault exception */
653 case T_TSSFLT: /* Invalid TSS exception */
654 case T_RESERVED: /* Unknown exception */
655 case T_MCHK: /* Machine check exception */
657 case T_CACHEFLT: /* Cache flush exception */
659 rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
662 EXC_RtlRaiseException( &rec, context );
666 /**********************************************************************
669 * Implementation of SIGTRAP handler.
671 static void do_trap( CONTEXT *context, int trap_code )
673 EXCEPTION_RECORD rec;
675 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
676 rec.ExceptionRecord = NULL;
677 rec.ExceptionAddress = (LPVOID)context->Eip;
678 rec.NumberParameters = 0;
682 case T_TRCTRAP: /* Single-step exception */
683 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
684 context->EFlags &= ~0x100; /* clear single-step flag */
686 case T_BPTFLT: /* Breakpoint exception */
687 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
690 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
693 EXC_RtlRaiseException( &rec, context );
697 /**********************************************************************
700 * Implementation of SIGFPE handler
702 static void do_fpe( CONTEXT *context, int trap_code )
704 EXCEPTION_RECORD rec;
708 case T_DIVIDE: /* Division by zero exception */
709 rec.ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
711 case T_FPOPFLT: /* Coprocessor segment overrun */
712 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
714 case T_ARITHTRAP: /* Floating point exception */
715 case T_UNKNOWN: /* Unknown fault code */
716 rec.ExceptionCode = get_fpu_code( context );
719 ERR( "Got unexpected trap %d\n", trap_code );
720 rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
723 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
724 rec.ExceptionRecord = NULL;
725 rec.ExceptionAddress = (LPVOID)context->Eip;
726 rec.NumberParameters = 0;
727 EXC_RtlRaiseException( &rec, context );
731 /**********************************************************************
734 * Handler for SIGSEGV and related errors.
736 static HANDLER_DEF(segv_handler)
739 save_context( &context, HANDLER_CONTEXT );
740 do_segv( &context, get_trap_code(HANDLER_CONTEXT),
741 get_cr2_value(HANDLER_CONTEXT), get_error_code(HANDLER_CONTEXT) );
742 restore_context( &context, HANDLER_CONTEXT );
746 /**********************************************************************
749 * Handler for SIGTRAP.
751 static HANDLER_DEF(trap_handler)
754 save_context( &context, HANDLER_CONTEXT );
755 do_trap( &context, get_trap_code(HANDLER_CONTEXT) );
756 restore_context( &context, HANDLER_CONTEXT );
760 /**********************************************************************
763 * Handler for SIGFPE.
765 static HANDLER_DEF(fpe_handler)
768 save_fpu( &context, HANDLER_CONTEXT );
769 save_context( &context, HANDLER_CONTEXT );
770 do_fpe( &context, get_trap_code(HANDLER_CONTEXT) );
771 restore_context( &context, HANDLER_CONTEXT );
772 restore_fpu( &context, HANDLER_CONTEXT );
776 /**********************************************************************
779 * Handler for SIGINT.
781 static HANDLER_DEF(int_handler)
783 EXCEPTION_RECORD rec;
786 save_context( &context, HANDLER_CONTEXT );
787 rec.ExceptionCode = CONTROL_C_EXIT;
788 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
789 rec.ExceptionRecord = NULL;
790 rec.ExceptionAddress = (LPVOID)context.Eip;
791 rec.NumberParameters = 0;
792 EXC_RtlRaiseException( &rec, &context );
793 restore_context( &context, HANDLER_CONTEXT );
797 /***********************************************************************
800 * Set a signal handler
802 static int set_handler( int sig, int have_sigaltstack, void (*func)() )
804 struct sigaction sig_act;
807 if (!have_sigaltstack && NtCurrentTeb()->signal_stack)
809 struct kernel_sigaction sig_act;
810 sig_act.ksa_handler = func;
811 sig_act.ksa_flags = SA_RESTART | SA_NOMASK;
812 sig_act.ksa_mask = 0;
813 /* point to the top of the stack */
814 sig_act.ksa_restorer = (char *)NtCurrentTeb()->signal_stack + SIGNAL_STACK_SIZE;
815 return wine_sigaction( sig, &sig_act, NULL );
818 sig_act.sa_handler = func;
819 sigemptyset( &sig_act.sa_mask );
822 sig_act.sa_flags = SA_RESTART | SA_NOMASK;
823 #elif defined (__svr4__) || defined(_SCO_DS)
824 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
826 sig_act.sa_flags = 0;
830 if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
832 return sigaction( sig, &sig_act, NULL );
836 /**********************************************************************
839 BOOL SIGNAL_Init(void)
841 int have_sigaltstack = 0;
843 #ifdef HAVE_SIGALTSTACK
844 struct sigaltstack ss;
845 if ((ss.ss_sp = NtCurrentTeb()->signal_stack))
847 ss.ss_size = SIGNAL_STACK_SIZE;
849 if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
851 /* sigaltstack may fail because the kernel is too old, or
852 because glibc is brain-dead. In the latter case a
853 direct system call should succeed. */
854 else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
857 #endif /* HAVE_SIGALTSTACK */
859 /* automatic child reaping to avoid zombies */
860 signal( SIGCHLD, SIG_IGN );
862 if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
863 if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
864 if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
865 if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
867 if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
870 if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
881 /**********************************************************************
884 * Enter vm86 mode with the specified register context.
886 void __wine_enter_vm86( CONTEXT *context )
888 EXCEPTION_RECORD rec;
890 struct vm86plus_struct vm86;
892 memset( &vm86, 0, sizeof(vm86) );
895 vm86.regs.eax = context->Eax;
896 vm86.regs.ebx = context->Ebx;
897 vm86.regs.ecx = context->Ecx;
898 vm86.regs.edx = context->Edx;
899 vm86.regs.esi = context->Esi;
900 vm86.regs.edi = context->Edi;
901 vm86.regs.esp = context->Esp;
902 vm86.regs.ebp = context->Ebp;
903 vm86.regs.eip = context->Eip;
904 vm86.regs.cs = context->SegCs;
905 vm86.regs.ds = context->SegDs;
906 vm86.regs.es = context->SegEs;
907 vm86.regs.fs = context->SegFs;
908 vm86.regs.gs = context->SegGs;
909 vm86.regs.ss = context->SegSs;
910 vm86.regs.eflags = context->EFlags;
914 res = vm86_enter( &vm86 );
920 } while (VM86_TYPE(res) == VM86_SIGNAL);
922 context->Eax = vm86.regs.eax;
923 context->Ebx = vm86.regs.ebx;
924 context->Ecx = vm86.regs.ecx;
925 context->Edx = vm86.regs.edx;
926 context->Esi = vm86.regs.esi;
927 context->Edi = vm86.regs.edi;
928 context->Esp = vm86.regs.esp;
929 context->Ebp = vm86.regs.ebp;
930 context->Eip = vm86.regs.eip;
931 context->SegCs = vm86.regs.cs;
932 context->SegDs = vm86.regs.ds;
933 context->SegEs = vm86.regs.es;
934 context->SegFs = vm86.regs.fs;
935 context->SegGs = vm86.regs.gs;
936 context->SegSs = vm86.regs.ss;
937 context->EFlags = vm86.regs.eflags;
939 switch(VM86_TYPE(res))
941 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
942 do_segv( context, T_PROTFLT, 0, 0 );
944 case VM86_TRAP: /* return due to DOS-debugger request */
945 do_trap( context, VM86_ARG(res) );
947 case VM86_INTx: /* int3/int x instruction (ARG = x) */
948 rec.ExceptionCode = EXCEPTION_VM86_INTx;
950 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
951 rec.ExceptionCode = EXCEPTION_VM86_STI;
953 case VM86_PICRETURN: /* return due to pending PIC request */
954 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
957 ERR( "unhandled result from vm86 mode %x\n", res );
960 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
961 rec.ExceptionRecord = NULL;
962 rec.ExceptionAddress = (LPVOID)context->Eip;
963 rec.NumberParameters = 1;
964 rec.ExceptionInformation[0] = VM86_ARG(res);
965 EXC_RtlRaiseException( &rec, context );
970 void __wine_enter_vm86( CONTEXT *context )
972 MESSAGE("vm86 mode not supported on this platform\n");
976 /**********************************************************************
977 * DbgBreakPoint (NTDLL)
979 void WINAPI DbgBreakPoint(void);
980 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
982 /**********************************************************************
983 * DbgUserBreakPoint (NTDLL)
985 void WINAPI DbgUserBreakPoint(void);
986 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
988 #endif /* __i386__ */