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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
24 #include "wine/port.h"
31 #include <sys/types.h>
36 #ifdef HAVE_SYS_PARAM_H
37 # include <sys/param.h>
42 # ifdef HAVE_SYS_SYSCALL_H
43 # include <sys/syscall.h>
47 #ifdef HAVE_SYS_VM86_H
48 # include <sys/vm86.h>
51 #ifdef HAVE_SYS_SIGNAL_H
52 # include <sys/signal.h>
54 #ifdef HAVE_SYS_SYSCTL_H
55 # include <sys/sysctl.h>
60 #include "wine/library.h"
61 #include "ntdll_misc.h"
63 #ifdef HAVE_VALGRIND_MEMCHECK_H
64 #include <valgrind/memcheck.h>
67 /***********************************************************************
68 * signal context platform-specific definitions
73 typedef ucontext_t SIGCONTEXT;
75 #define EAX_sig(context) ((context)->uc_mcontext.gregs[REG_EAX])
76 #define EBX_sig(context) ((context)->uc_mcontext.gregs[REG_EBX])
77 #define ECX_sig(context) ((context)->uc_mcontext.gregs[REG_ECX])
78 #define EDX_sig(context) ((context)->uc_mcontext.gregs[REG_EDX])
79 #define ESI_sig(context) ((context)->uc_mcontext.gregs[REG_ESI])
80 #define EDI_sig(context) ((context)->uc_mcontext.gregs[REG_EDI])
81 #define EBP_sig(context) ((context)->uc_mcontext.gregs[REG_EBP])
82 #define ESP_sig(context) ((context)->uc_mcontext.gregs[REG_ESP])
84 #define CS_sig(context) ((context)->uc_mcontext.gregs[REG_CS])
85 #define DS_sig(context) ((context)->uc_mcontext.gregs[REG_DS])
86 #define ES_sig(context) ((context)->uc_mcontext.gregs[REG_ES])
87 #define SS_sig(context) ((context)->uc_mcontext.gregs[REG_SS])
88 #define FS_sig(context) ((context)->uc_mcontext.gregs[REG_FS])
89 #define GS_sig(context) ((context)->uc_mcontext.gregs[REG_GS])
91 #define EFL_sig(context) ((context)->uc_mcontext.gregs[REG_EFL])
92 #define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
93 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
94 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
96 #define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
98 #define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
100 int vm86_enter( void **vm86_ptr );
101 void vm86_return(void);
102 void vm86_return_end(void);
103 __ASM_GLOBAL_FUNC(vm86_enter,
105 "movl %esp, %ebp\n\t"
106 "movl $166,%eax\n\t" /*SYS_vm86*/
107 "movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
108 "movl (%ecx),%ecx\n\t"
110 "movl $1,%ebx\n\t" /*VM86_ENTER*/
111 "pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
115 ".globl " __ASM_NAME("vm86_return") "\n\t"
116 __ASM_FUNC("vm86_return") "\n"
117 __ASM_NAME("vm86_return") ":\n\t"
123 "testl %eax,%eax\n\t"
125 "cmpb $0,%al\n\t" /* VM86_SIGNAL */
126 "je " __ASM_NAME("vm86_enter") "\n\t"
128 "movl 4(%esp),%ecx\n\t" /* vm86_ptr */
130 ".globl " __ASM_NAME("vm86_return_end") "\n\t"
131 __ASM_FUNC("vm86_return_end") "\n"
132 __ASM_NAME("vm86_return_end") ":\n\t"
135 #ifdef HAVE_SYS_VM86_H
143 #include <machine/frame.h>
144 typedef struct trapframe SIGCONTEXT;
146 #define EAX_sig(context) ((context)->tf_eax)
147 #define EBX_sig(context) ((context)->tf_ebx)
148 #define ECX_sig(context) ((context)->tf_ecx)
149 #define EDX_sig(context) ((context)->tf_edx)
150 #define ESI_sig(context) ((context)->tf_esi)
151 #define EDI_sig(context) ((context)->tf_edi)
152 #define EBP_sig(context) ((context)->tf_ebp)
154 #define CS_sig(context) ((context)->tf_cs)
155 #define DS_sig(context) ((context)->tf_ds)
156 #define ES_sig(context) ((context)->tf_es)
157 #define SS_sig(context) ((context)->tf_ss)
159 #define EFL_sig(context) ((context)->tf_eflags)
161 #define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
162 #define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
166 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
168 typedef struct sigcontext SIGCONTEXT;
170 #define EAX_sig(context) ((context)->sc_eax)
171 #define EBX_sig(context) ((context)->sc_ebx)
172 #define ECX_sig(context) ((context)->sc_ecx)
173 #define EDX_sig(context) ((context)->sc_edx)
174 #define ESI_sig(context) ((context)->sc_esi)
175 #define EDI_sig(context) ((context)->sc_edi)
176 #define EBP_sig(context) ((context)->sc_ebp)
178 #define CS_sig(context) ((context)->sc_cs)
179 #define DS_sig(context) ((context)->sc_ds)
180 #define ES_sig(context) ((context)->sc_es)
181 #define FS_sig(context) ((context)->sc_fs)
182 #define GS_sig(context) ((context)->sc_gs)
183 #define SS_sig(context) ((context)->sc_ss)
185 #define TRAP_sig(context) ((context)->sc_trapno)
186 #define ERROR_sig(context) ((context)->sc_err)
187 #define EFL_sig(context) ((context)->sc_eflags)
189 #define EIP_sig(context) ((context)->sc_eip)
190 #define ESP_sig(context) ((context)->sc_esp)
194 #if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
197 #include <sys/regset.h>
201 #include <sys/ucontext.h>
203 typedef struct ucontext SIGCONTEXT;
209 #define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
210 #define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
211 #define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
212 #define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
213 #define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
214 #define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
215 #define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
217 #define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
218 #define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
219 #define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
220 #define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
222 #define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
223 #define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
225 #define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
227 #define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
229 #define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
231 #define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
233 #define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
236 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
239 #endif /* svr4 || SCO_DS */
242 # include <sys/ucontext.h>
244 typedef ucontext_t SIGCONTEXT;
246 #define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
247 #define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
248 #define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
249 #define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
250 #define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
251 #define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
252 #define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
254 #define CS_sig(context) ((context)->uc_mcontext->ss.cs)
255 #define DS_sig(context) ((context)->uc_mcontext->ss.ds)
256 #define ES_sig(context) ((context)->uc_mcontext->ss.es)
257 #define FS_sig(context) ((context)->uc_mcontext->ss.fs)
258 #define GS_sig(context) ((context)->uc_mcontext->ss.gs)
259 #define SS_sig(context) ((context)->uc_mcontext->ss.ss)
261 #define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
263 #define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
264 #define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
266 #define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
267 #define ERROR_sig(context) ((context)->uc_mcontext->es.err)
269 #endif /* __APPLE__ */
271 #include "wine/exception.h"
272 #include "wine/debug.h"
274 WINE_DEFAULT_DEBUG_CHANNEL(seh);
276 typedef int (*wine_signal_handler)(unsigned int sig);
278 static size_t signal_stack_mask;
279 static size_t signal_stack_size;
281 static wine_signal_handler handlers[256];
283 extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
287 TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
288 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
289 TRAP_x86_DIVIDE = T_DIVIDE, /* Division by zero exception */
290 TRAP_x86_TRCTRAP = T_TRCTRAP, /* Single-step exception */
291 TRAP_x86_NMI = T_NMI, /* NMI interrupt */
292 TRAP_x86_BPTFLT = T_BPTFLT, /* Breakpoint exception */
293 TRAP_x86_OFLOW = T_OFLOW, /* Overflow exception */
294 TRAP_x86_BOUND = T_BOUND, /* Bound range exception */
295 TRAP_x86_PRIVINFLT = T_PRIVINFLT, /* Invalid opcode exception */
296 TRAP_x86_DNA = T_DNA, /* Device not available exception */
297 TRAP_x86_DOUBLEFLT = T_DOUBLEFLT, /* Double fault exception */
298 TRAP_x86_FPOPFLT = T_FPOPFLT, /* Coprocessor segment overrun */
299 TRAP_x86_TSSFLT = T_TSSFLT, /* Invalid TSS exception */
300 TRAP_x86_SEGNPFLT = T_SEGNPFLT, /* Segment not present exception */
301 TRAP_x86_STKFLT = T_STKFLT, /* Stack fault */
302 TRAP_x86_PROTFLT = T_PROTFLT, /* General protection fault */
303 TRAP_x86_PAGEFLT = T_PAGEFLT, /* Page fault */
304 TRAP_x86_ARITHTRAP = T_ARITHTRAP, /* Floating point exception */
305 TRAP_x86_ALIGNFLT = T_ALIGNFLT, /* Alignment check exception */
306 TRAP_x86_MCHK = T_MCHK, /* Machine check exception */
307 TRAP_x86_CACHEFLT = T_XMMFLT /* Cache flush exception */
309 TRAP_x86_DIVIDE = 0, /* Division by zero exception */
310 TRAP_x86_TRCTRAP = 1, /* Single-step exception */
311 TRAP_x86_NMI = 2, /* NMI interrupt */
312 TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
313 TRAP_x86_OFLOW = 4, /* Overflow exception */
314 TRAP_x86_BOUND = 5, /* Bound range exception */
315 TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
316 TRAP_x86_DNA = 7, /* Device not available exception */
317 TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
318 TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
319 TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
320 TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
321 TRAP_x86_STKFLT = 12, /* Stack fault */
322 TRAP_x86_PROTFLT = 13, /* General protection fault */
323 TRAP_x86_PAGEFLT = 14, /* Page fault */
324 TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
325 TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
326 TRAP_x86_MCHK = 18, /* Machine check exception */
327 TRAP_x86_CACHEFLT = 19 /* Cache flush exception */
332 /***********************************************************************
335 inline static int dispatch_signal(unsigned int sig)
337 if (handlers[sig] == NULL) return 0;
338 return handlers[sig](sig);
342 /***********************************************************************
345 * Get the trap code for a signal.
347 static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
350 return TRAP_sig(sigcontext);
352 return TRAP_x86_UNKNOWN; /* unknown trap code */
356 /***********************************************************************
359 * Get the error code for a signal.
361 static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
364 return ERROR_sig(sigcontext);
370 /***********************************************************************
373 * Get the base of the signal stack for the current thread.
375 static inline void *get_signal_stack(void)
377 return (char *)NtCurrentTeb() + 4096;
381 /***********************************************************************
384 * Get the current teb based on the stack pointer.
386 static inline TEB *get_current_teb(void)
389 __asm__("movl %%esp,%0" : "=g" (esp) );
390 return (TEB *)(esp & ~signal_stack_mask);
395 /***********************************************************************
398 * Set the register values from a vm86 structure.
400 static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
402 context->ContextFlags = CONTEXT_FULL;
403 context->Eax = vm86->regs.eax;
404 context->Ebx = vm86->regs.ebx;
405 context->Ecx = vm86->regs.ecx;
406 context->Edx = vm86->regs.edx;
407 context->Esi = vm86->regs.esi;
408 context->Edi = vm86->regs.edi;
409 context->Esp = vm86->regs.esp;
410 context->Ebp = vm86->regs.ebp;
411 context->Eip = vm86->regs.eip;
412 context->SegCs = vm86->regs.cs;
413 context->SegDs = vm86->regs.ds;
414 context->SegEs = vm86->regs.es;
415 context->SegFs = vm86->regs.fs;
416 context->SegGs = vm86->regs.gs;
417 context->SegSs = vm86->regs.ss;
418 context->EFlags = vm86->regs.eflags;
422 /***********************************************************************
423 * restore_vm86_context
425 * Build a vm86 structure from the register values.
427 static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
429 vm86->regs.eax = context->Eax;
430 vm86->regs.ebx = context->Ebx;
431 vm86->regs.ecx = context->Ecx;
432 vm86->regs.edx = context->Edx;
433 vm86->regs.esi = context->Esi;
434 vm86->regs.edi = context->Edi;
435 vm86->regs.esp = context->Esp;
436 vm86->regs.ebp = context->Ebp;
437 vm86->regs.eip = context->Eip;
438 vm86->regs.cs = context->SegCs;
439 vm86->regs.ds = context->SegDs;
440 vm86->regs.es = context->SegEs;
441 vm86->regs.fs = context->SegFs;
442 vm86->regs.gs = context->SegGs;
443 vm86->regs.ss = context->SegSs;
444 vm86->regs.eflags = context->EFlags;
448 /**********************************************************************
449 * merge_vm86_pending_flags
451 * Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
452 * raises exception if there are pending events and VIF flag
453 * has been turned on.
455 * Called from __wine_enter_vm86 because vm86_enter
456 * doesn't check for pending events.
458 * Called from raise_vm86_sti_exception to check for
459 * pending events in a signal safe way.
461 static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
463 BOOL check_pending = TRUE;
464 struct vm86plus_struct *vm86 =
465 (struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
468 * In order to prevent a race when SIGUSR2 occurs while
469 * we are returning from exception handler, pending events
470 * will be rechecked after each raised exception.
472 while (check_pending && NtCurrentTeb()->vm86_pending)
474 check_pending = FALSE;
475 ntdll_get_thread_data()->vm86_ptr = NULL;
478 * If VIF is set, throw exception.
479 * Note that SIGUSR2 may turn VIF flag off so
480 * VIF check must occur only when TEB.vm86_ptr is NULL.
482 if (vm86->regs.eflags & VIF_MASK)
485 save_vm86_context( &vcontext, vm86 );
487 rec->ExceptionCode = EXCEPTION_VM86_STI;
488 rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
489 rec->ExceptionRecord = NULL;
490 rec->NumberParameters = 0;
491 rec->ExceptionAddress = (LPVOID)vcontext.Eip;
493 vcontext.EFlags &= ~VIP_MASK;
494 NtCurrentTeb()->vm86_pending = 0;
495 __regs_RtlRaiseException( rec, &vcontext );
497 restore_vm86_context( &vcontext, vm86 );
498 check_pending = TRUE;
501 ntdll_get_thread_data()->vm86_ptr = vm86;
505 * Merge VIP flags in a signal safe way. This requires
506 * that the following operation compiles into atomic
509 vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
511 #endif /* __HAVE_VM86 */
514 typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
517 /***********************************************************************
520 * Handler initialization when the full context is not needed.
522 inline static void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
524 void *stack = (void *)ESP_sig(sigcontext);
525 TEB *teb = get_current_teb();
526 struct ntdll_thread_regs *thread_regs = (struct ntdll_thread_regs *)teb->SpareBytes1;
528 /* get %fs and %gs at time of the fault */
530 *fs = LOWORD(FS_sig(sigcontext));
535 *gs = LOWORD(GS_sig(sigcontext));
540 wine_set_fs( thread_regs->fs );
542 /* now restore a proper %gs for the fault handler */
543 if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
544 !wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
547 * Win16 or DOS protected mode. Note that during switch
548 * from 16-bit mode to linear mode, CS may be set to system
549 * segment before FS is restored. Fortunately, in this case
550 * SS is still non-system segment. This is why both CS and SS
553 wine_set_gs( thread_regs->gs );
554 stack = teb->WOW32Reserved;
557 else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
559 unsigned int *int_stack = stack;
560 /* fetch the saved %gs from the stack */
561 wine_set_gs( int_stack[0] );
564 else /* 32-bit mode */
567 wine_set_gs( GS_sig(sigcontext) );
574 /***********************************************************************
577 * Save the thread FPU context.
579 inline static void save_fpu( CONTEXT *context )
582 context->ContextFlags |= CONTEXT_FLOATING_POINT;
583 __asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
588 /***********************************************************************
591 * Restore the FPU context to a sigcontext.
593 inline static void restore_fpu( const CONTEXT *context )
595 FLOATING_SAVE_AREA float_status = context->FloatSave;
596 /* reset the current interrupt status */
597 float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
599 __asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
600 #endif /* __GNUC__ */
604 /***********************************************************************
607 * Build a context structure from the signal info.
609 inline static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
611 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
613 memset(context, 0, sizeof(*context));
614 context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
615 context->Eax = EAX_sig(sigcontext);
616 context->Ebx = EBX_sig(sigcontext);
617 context->Ecx = ECX_sig(sigcontext);
618 context->Edx = EDX_sig(sigcontext);
619 context->Esi = ESI_sig(sigcontext);
620 context->Edi = EDI_sig(sigcontext);
621 context->Ebp = EBP_sig(sigcontext);
622 context->EFlags = EFL_sig(sigcontext);
623 context->Eip = EIP_sig(sigcontext);
624 context->Esp = ESP_sig(sigcontext);
625 context->SegCs = LOWORD(CS_sig(sigcontext));
626 context->SegDs = LOWORD(DS_sig(sigcontext));
627 context->SegEs = LOWORD(ES_sig(sigcontext));
630 context->SegSs = LOWORD(SS_sig(sigcontext));
631 context->Dr0 = regs->dr0;
632 context->Dr1 = regs->dr1;
633 context->Dr2 = regs->dr2;
634 context->Dr3 = regs->dr3;
635 context->Dr6 = regs->dr6;
636 context->Dr7 = regs->dr7;
639 if (FPU_sig(sigcontext))
641 context->ContextFlags |= CONTEXT_FLOATING_POINT;
642 context->FloatSave = *FPU_sig(sigcontext);
652 /***********************************************************************
655 * Restore the signal info from the context.
657 inline static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
659 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
661 regs->dr0 = context->Dr0;
662 regs->dr1 = context->Dr1;
663 regs->dr2 = context->Dr2;
664 regs->dr3 = context->Dr3;
665 regs->dr6 = context->Dr6;
666 regs->dr7 = context->Dr7;
667 EAX_sig(sigcontext) = context->Eax;
668 EBX_sig(sigcontext) = context->Ebx;
669 ECX_sig(sigcontext) = context->Ecx;
670 EDX_sig(sigcontext) = context->Edx;
671 ESI_sig(sigcontext) = context->Esi;
672 EDI_sig(sigcontext) = context->Edi;
673 EBP_sig(sigcontext) = context->Ebp;
674 EFL_sig(sigcontext) = context->EFlags;
675 EIP_sig(sigcontext) = context->Eip;
676 ESP_sig(sigcontext) = context->Esp;
677 CS_sig(sigcontext) = context->SegCs;
678 DS_sig(sigcontext) = context->SegDs;
679 ES_sig(sigcontext) = context->SegEs;
680 SS_sig(sigcontext) = context->SegSs;
682 GS_sig(sigcontext) = context->SegGs;
684 wine_set_gs( context->SegGs );
687 FS_sig(sigcontext) = context->SegFs;
689 wine_set_fs( context->SegFs );
693 if (FPU_sig(sigcontext))
695 *FPU_sig(sigcontext) = context->FloatSave;
700 restore_fpu( context );
705 /***********************************************************************
708 * Register function to get the context of the current thread.
710 void WINAPI __regs_get_cpu_context( CONTEXT *context, CONTEXT *regs )
715 DEFINE_REGS_ENTRYPOINT( get_cpu_context, 4, 4 );
718 /***********************************************************************
721 * Set the new CPU context. Used by NtSetContextThread.
723 void set_cpu_context( const CONTEXT *context )
725 DWORD flags = context->ContextFlags & ~CONTEXT_i386;
727 if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
729 if (flags & CONTEXT_DEBUG_REGISTERS)
731 struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
732 regs->dr0 = context->Dr0;
733 regs->dr1 = context->Dr1;
734 regs->dr2 = context->Dr2;
735 regs->dr3 = context->Dr3;
736 regs->dr6 = context->Dr6;
737 regs->dr7 = context->Dr7;
739 if (flags & CONTEXT_FULL)
741 if ((flags & CONTEXT_FULL) != (CONTEXT_FULL & ~CONTEXT_i386))
742 FIXME( "setting partial context (%lx) not supported\n", flags );
744 __wine_call_from_32_restore_regs( context );
749 /***********************************************************************
750 * is_privileged_instr
752 * Check if the fault location is a privileged instruction.
753 * Based on the instruction emulation code in dlls/kernel/instr.c.
755 static inline int is_privileged_instr( CONTEXT86 *context )
758 unsigned int prefix_count = 0;
760 if (!wine_ldt_is_system( context->SegCs )) return 0;
761 instr = (BYTE *)context->Eip;
763 for (;;) switch(*instr)
765 /* instruction prefixes */
766 case 0x2e: /* %cs: */
767 case 0x36: /* %ss: */
768 case 0x3e: /* %ds: */
769 case 0x26: /* %es: */
770 case 0x64: /* %fs: */
771 case 0x65: /* %gs: */
772 case 0x66: /* opcode size */
773 case 0x67: /* addr size */
774 case 0xf0: /* lock */
775 case 0xf2: /* repne */
776 case 0xf3: /* repe */
777 if (++prefix_count >= 15) return 0;
781 case 0x0f: /* extended instruction */
784 case 0x20: /* mov crX, reg */
785 case 0x21: /* mov drX, reg */
786 case 0x22: /* mov reg, crX */
787 case 0x23: /* mov reg drX */
791 case 0x6c: /* insb (%dx) */
792 case 0x6d: /* insl (%dx) */
793 case 0x6e: /* outsb (%dx) */
794 case 0x6f: /* outsl (%dx) */
795 case 0xcd: /* int $xx */
796 case 0xe4: /* inb al,XX */
797 case 0xe5: /* in (e)ax,XX */
798 case 0xe6: /* outb XX,al */
799 case 0xe7: /* out XX,(e)ax */
800 case 0xec: /* inb (%dx),%al */
801 case 0xed: /* inl (%dx),%eax */
802 case 0xee: /* outb %al,(%dx) */
803 case 0xef: /* outl %eax,(%dx) */
814 #include "pshpack1.h"
817 DWORD movl; /* movl this,4(%esp) */
819 BYTE jmp; /* jmp func */
824 /**********************************************************************
827 * Check if code destination is an ATL thunk, and emulate it if so.
829 static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
831 struct atl_thunk *thunk = (struct atl_thunk *)rec->ExceptionInformation[1];
833 if (thunk->movl != 0x042444c7 || thunk->jmp != 0xe9) return FALSE;
834 *((DWORD *)context->Esp + 1) = thunk->this;
835 context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
836 TRACE( "emulating ATL thunk at %p, func=%08lx arg=%08lx\n",
837 thunk, context->Eip, *((DWORD *)context->Esp + 1) );
842 /***********************************************************************
845 * Setup a proper stack frame for the raise function, and modify the
846 * sigcontext so that the return from the signal handler will call
847 * the raise function.
849 static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
853 void *ret_addr; /* return address from raise_func */
854 EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
855 CONTEXT *context_ptr; /* second arg for raise_func */
857 EXCEPTION_RECORD rec;
864 stack = init_handler( sigcontext, &fs, &gs );
866 /* stack sanity checks */
868 if ((char *)stack >= (char *)get_signal_stack() &&
869 (char *)stack < (char *)get_signal_stack() + signal_stack_size)
871 ERR( "nested exception on signal stack in thread %04lx eip %08x esp %08x stack %p-%p\n",
872 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
873 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
874 NtCurrentTeb()->Tib.StackBase );
875 server_abort_thread(1);
878 if (stack - 1 > stack || /* check for overflow in subtraction */
879 (char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit ||
880 (char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
882 UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)stack;
885 ERR( "stack overflow %u bytes in thread %04lx eip %08x esp %08x stack %p-%p\n",
886 diff, GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
887 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
888 NtCurrentTeb()->Tib.StackBase );
889 server_abort_thread(1);
891 else WARN( "exception outside of stack limits in thread %04lx eip %08x esp %08x stack %p-%p\n",
892 GetCurrentThreadId(), (unsigned int) EIP_sig(sigcontext),
893 (unsigned int) ESP_sig(sigcontext), NtCurrentTeb()->Tib.StackLimit,
894 NtCurrentTeb()->Tib.StackBase );
897 stack--; /* push the stack_layout structure */
898 #ifdef HAVE_VALGRIND_MEMCHECK_H
899 VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
901 stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
902 stack->rec_ptr = &stack->rec;
903 stack->context_ptr = &stack->context;
905 stack->rec.ExceptionRecord = NULL;
906 stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
907 stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
908 stack->rec.NumberParameters = 0;
910 save_context( &stack->context, sigcontext, fs, gs );
912 /* now modify the sigcontext to return to the raise function */
913 ESP_sig(sigcontext) = (DWORD)stack;
914 EIP_sig(sigcontext) = (DWORD)func;
915 EFL_sig(sigcontext) &= ~0x100; /* clear single-step flag */
916 CS_sig(sigcontext) = wine_get_cs();
917 DS_sig(sigcontext) = wine_get_ds();
918 ES_sig(sigcontext) = wine_get_es();
919 FS_sig(sigcontext) = wine_get_fs();
920 GS_sig(sigcontext) = wine_get_gs();
921 SS_sig(sigcontext) = wine_get_ss();
923 return stack->rec_ptr;
927 /***********************************************************************
928 * get_exception_context
930 * Get a pointer to the context built by setup_exception.
932 static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
934 return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
938 /**********************************************************************
941 * Get the FPU exception code from the FPU status.
943 static inline DWORD get_fpu_code( const CONTEXT *context )
945 DWORD status = context->FloatSave.StatusWord;
947 if (status & 0x01) /* IE */
949 if (status & 0x40) /* SF */
950 return EXCEPTION_FLT_STACK_CHECK;
952 return EXCEPTION_FLT_INVALID_OPERATION;
954 if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
955 if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
956 if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
957 if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
958 if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
959 return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
963 /**********************************************************************
964 * raise_segv_exception
966 static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
968 switch(rec->ExceptionCode)
970 case EXCEPTION_ACCESS_VIOLATION:
971 if (rec->NumberParameters == 2)
973 if ((rec->ExceptionInformation[0] == 8) && check_atl_thunk( rec, context )) goto done;
974 rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] );
977 case EXCEPTION_DATATYPE_MISALIGNMENT:
978 /* FIXME: pass through exception handler first? */
979 if (context->EFlags & 0x00040000)
981 /* Disable AC flag, return */
982 context->EFlags &= ~0x00040000;
987 __regs_RtlRaiseException( rec, context );
989 NtSetContextThread( GetCurrentThread(), context );
993 /**********************************************************************
994 * raise_trap_exception
996 static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
998 if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
1000 if (context->EFlags & 0x100)
1002 context->EFlags &= ~0x100; /* clear single-step flag */
1004 else /* hardware breakpoint, fetch the debug registers */
1006 context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
1007 NtGetContextThread(GetCurrentThread(), context);
1008 /* do we really have a bp from a debug register ?
1009 * if not, then someone did a kill(SIGTRAP) on us, and we
1010 * shall return a breakpoint, not a single step exception
1012 if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1013 context->ContextFlags |= CONTEXT_FULL; /* restore flags */
1017 __regs_RtlRaiseException( rec, context );
1018 NtSetContextThread( GetCurrentThread(), context );
1022 /**********************************************************************
1025 * Generic raise function for exceptions that don't need special treatment.
1027 static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1029 __regs_RtlRaiseException( rec, context );
1030 NtSetContextThread( GetCurrentThread(), context );
1035 /**********************************************************************
1036 * raise_vm86_sti_exception
1038 static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
1040 /* merge_vm86_pending_flags merges the vm86_pending flag in safely */
1041 NtCurrentTeb()->vm86_pending |= VIP_MASK;
1043 if (ntdll_get_thread_data()->vm86_ptr)
1045 if (((char*)context->Eip >= (char*)vm86_return) &&
1046 ((char*)context->Eip <= (char*)vm86_return_end) &&
1047 (VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
1048 /* exiting from VM86, can't throw */
1051 merge_vm86_pending_flags( rec );
1053 else if (NtCurrentTeb()->dpmi_vif &&
1054 !wine_ldt_is_system(context->SegCs) &&
1055 !wine_ldt_is_system(context->SegSs))
1057 /* Executing DPMI code and virtual interrupts are enabled. */
1058 NtCurrentTeb()->vm86_pending = 0;
1059 __regs_RtlRaiseException( rec, context );
1062 NtSetContextThread( GetCurrentThread(), context );
1066 /**********************************************************************
1069 * Handler for SIGUSR2.
1070 * We use it to signal that the running __wine_enter_vm86() should
1071 * immediately set VIP_MASK, causing pending events to be handled
1072 * as early as possible.
1074 static void usr2_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1076 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_vm86_sti_exception );
1077 rec->ExceptionCode = EXCEPTION_VM86_STI;
1079 #endif /* __HAVE_VM86 */
1082 /**********************************************************************
1085 * Handler for SIGSEGV and related errors.
1087 static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1089 SIGCONTEXT *context = sigcontext;
1090 EXCEPTION_RECORD *rec = setup_exception( context, raise_segv_exception );
1092 switch(get_trap_code(context))
1094 case TRAP_x86_OFLOW: /* Overflow exception */
1095 rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
1097 case TRAP_x86_BOUND: /* Bound range exception */
1098 rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
1100 case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
1101 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1103 case TRAP_x86_STKFLT: /* Stack fault */
1104 rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
1106 case TRAP_x86_SEGNPFLT: /* Segment not present exception */
1107 case TRAP_x86_PROTFLT: /* General protection fault */
1108 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1109 if (!get_error_code(context) && is_privileged_instr( get_exception_context(rec) ))
1110 rec->ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1113 WORD err = get_error_code(context);
1114 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1115 rec->NumberParameters = 2;
1116 rec->ExceptionInformation[0] = 0;
1117 /* if error contains a LDT selector, use that as fault address */
1118 rec->ExceptionInformation[1] = (err & 7) == 4 ? (err & ~7) : 0xffffffff;
1121 case TRAP_x86_PAGEFLT: /* Page fault */
1122 rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
1123 rec->NumberParameters = 2;
1124 rec->ExceptionInformation[0] = (get_error_code(context) >> 1) & 0x09;
1125 rec->ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
1127 case TRAP_x86_ALIGNFLT: /* Alignment check exception */
1128 rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
1131 ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1133 case TRAP_x86_NMI: /* NMI interrupt */
1134 case TRAP_x86_DNA: /* Device not available exception */
1135 case TRAP_x86_DOUBLEFLT: /* Double fault exception */
1136 case TRAP_x86_TSSFLT: /* Invalid TSS exception */
1137 case TRAP_x86_MCHK: /* Machine check exception */
1138 case TRAP_x86_CACHEFLT: /* Cache flush exception */
1139 rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
1145 /**********************************************************************
1148 * Handler for SIGTRAP.
1150 static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1152 SIGCONTEXT *context = sigcontext;
1153 EXCEPTION_RECORD *rec = setup_exception( context, raise_trap_exception );
1155 switch(get_trap_code(context))
1157 case TRAP_x86_TRCTRAP: /* Single-step exception */
1158 rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
1160 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1161 rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
1164 rec->ExceptionCode = EXCEPTION_BREAKPOINT;
1170 /**********************************************************************
1173 * Handler for SIGFPE.
1175 static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1177 CONTEXT *win_context;
1178 SIGCONTEXT *context = sigcontext;
1179 EXCEPTION_RECORD *rec = setup_exception( context, raise_exception );
1181 win_context = get_exception_context( rec );
1183 switch(get_trap_code(context))
1185 case TRAP_x86_DIVIDE: /* Division by zero exception */
1186 rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
1188 case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
1189 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1191 case TRAP_x86_ARITHTRAP: /* Floating point exception */
1192 case TRAP_x86_UNKNOWN: /* Unknown fault code */
1193 rec->ExceptionCode = get_fpu_code( win_context );
1196 ERR( "Got unexpected trap %d\n", get_trap_code(context) );
1197 rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
1203 /**********************************************************************
1206 * Handler for SIGINT.
1208 * FIXME: should not be calling external functions on the signal stack.
1210 static void int_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1213 init_handler( sigcontext, &fs, &gs );
1214 if (!dispatch_signal(SIGINT))
1216 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1217 rec->ExceptionCode = CONTROL_C_EXIT;
1221 /**********************************************************************
1224 * Handler for SIGABRT.
1226 static void abrt_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1228 EXCEPTION_RECORD *rec = setup_exception( sigcontext, raise_exception );
1229 rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
1230 rec->ExceptionFlags = EH_NONCONTINUABLE;
1234 /**********************************************************************
1237 * Handler for SIGTERM.
1239 static void term_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1242 init_handler( sigcontext, &fs, &gs );
1243 server_abort_thread(0);
1247 /**********************************************************************
1250 * Handler for SIGUSR1, used to signal a thread that it got suspended.
1252 static void usr1_handler( int signal, siginfo_t *siginfo, void *sigcontext )
1257 init_handler( sigcontext, &fs, &gs );
1258 save_context( &context, sigcontext, fs, gs );
1259 wait_suspend( &context );
1260 restore_context( &context, sigcontext );
1264 /**********************************************************************
1265 * get_signal_stack_total_size
1267 * Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
1268 * Must be a power of two.
1270 size_t get_signal_stack_total_size(void)
1272 static const size_t teb_size = 4096; /* we reserve one page for the TEB */
1274 if (!signal_stack_size)
1276 size_t size = 4096, min_size = teb_size + max( MINSIGSTKSZ, 4096 );
1277 /* find the first power of two not smaller than min_size */
1278 while (size < min_size) size *= 2;
1279 signal_stack_mask = size - 1;
1280 signal_stack_size = size - teb_size;
1282 return signal_stack_size + teb_size;
1286 /***********************************************************************
1287 * __wine_set_signal_handler (NTDLL.@)
1289 int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
1291 if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
1292 if (handlers[sig] != NULL) return -2;
1293 handlers[sig] = wsh;
1298 /**********************************************************************
1301 BOOL SIGNAL_Init(void)
1303 struct sigaction sig_act;
1305 #ifdef HAVE_SIGALTSTACK
1306 struct sigaltstack ss;
1309 int mib[2], val = 1;
1312 mib[1] = KERN_THALTSTACK;
1313 sysctl( mib, 2, NULL, NULL, &val, sizeof(val) );
1316 ss.ss_sp = get_signal_stack();
1317 ss.ss_size = signal_stack_size;
1319 if (sigaltstack(&ss, NULL) == -1)
1321 perror( "sigaltstack" );
1324 #endif /* HAVE_SIGALTSTACK */
1326 sigemptyset( &sig_act.sa_mask );
1327 sigaddset( &sig_act.sa_mask, SIGINT );
1328 sigaddset( &sig_act.sa_mask, SIGUSR1 );
1329 sigaddset( &sig_act.sa_mask, SIGUSR2 );
1330 sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
1333 sig_act.sa_flags |= SA_ONSTACK;
1336 sig_act.sa_sigaction = int_handler;
1337 if (sigaction( SIGINT, &sig_act, NULL ) == -1) goto error;
1338 sig_act.sa_sigaction = fpe_handler;
1339 if (sigaction( SIGFPE, &sig_act, NULL ) == -1) goto error;
1340 sig_act.sa_sigaction = abrt_handler;
1341 if (sigaction( SIGABRT, &sig_act, NULL ) == -1) goto error;
1342 sig_act.sa_sigaction = term_handler;
1343 if (sigaction( SIGTERM, &sig_act, NULL ) == -1) goto error;
1344 sig_act.sa_sigaction = usr1_handler;
1345 if (sigaction( SIGUSR1, &sig_act, NULL ) == -1) goto error;
1347 sig_act.sa_sigaction = segv_handler;
1348 if (sigaction( SIGSEGV, &sig_act, NULL ) == -1) goto error;
1349 if (sigaction( SIGILL, &sig_act, NULL ) == -1) goto error;
1351 if (sigaction( SIGBUS, &sig_act, NULL ) == -1) goto error;
1355 sig_act.sa_sigaction = trap_handler;
1356 if (sigaction( SIGTRAP, &sig_act, NULL ) == -1) goto error;
1360 sig_act.sa_sigaction = usr2_handler;
1361 if (sigaction( SIGUSR2, &sig_act, NULL ) == -1) goto error;
1367 perror("sigaction");
1373 /**********************************************************************
1374 * __wine_enter_vm86 (NTDLL.@)
1376 * Enter vm86 mode with the specified register context.
1378 void __wine_enter_vm86( CONTEXT *context )
1380 EXCEPTION_RECORD rec;
1382 struct vm86plus_struct vm86;
1384 memset( &vm86, 0, sizeof(vm86) );
1387 restore_vm86_context( context, &vm86 );
1389 ntdll_get_thread_data()->vm86_ptr = &vm86;
1390 merge_vm86_pending_flags( &rec );
1392 res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
1399 save_vm86_context( context, &vm86 );
1401 rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
1402 rec.ExceptionRecord = NULL;
1403 rec.ExceptionAddress = (LPVOID)context->Eip;
1404 rec.NumberParameters = 0;
1406 switch(VM86_TYPE(res))
1408 case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
1409 rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
1410 raise_segv_exception( &rec, context );
1412 case VM86_TRAP: /* return due to DOS-debugger request */
1413 switch(VM86_ARG(res))
1415 case TRAP_x86_TRCTRAP: /* Single-step exception */
1416 rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
1418 case TRAP_x86_BPTFLT: /* Breakpoint exception */
1419 rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
1422 rec.ExceptionCode = EXCEPTION_BREAKPOINT;
1426 case VM86_INTx: /* int3/int x instruction (ARG = x) */
1427 rec.ExceptionCode = EXCEPTION_VM86_INTx;
1428 rec.NumberParameters = 1;
1429 rec.ExceptionInformation[0] = VM86_ARG(res);
1431 case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
1432 context->EFlags |= VIF_MASK;
1433 context->EFlags &= ~VIP_MASK;
1434 NtCurrentTeb()->vm86_pending = 0;
1435 rec.ExceptionCode = EXCEPTION_VM86_STI;
1437 case VM86_PICRETURN: /* return due to pending PIC request */
1438 rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
1440 case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
1442 ERR( "unhandled result from vm86 mode %x\n", res );
1445 __regs_RtlRaiseException( &rec, context );
1449 #else /* __HAVE_VM86 */
1450 /**********************************************************************
1451 * __wine_enter_vm86 (NTDLL.@)
1453 void __wine_enter_vm86( CONTEXT *context )
1455 MESSAGE("vm86 mode not supported on this platform\n");
1457 #endif /* __HAVE_VM86 */
1459 /**********************************************************************
1460 * DbgBreakPoint (NTDLL.@)
1462 __ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
1464 /**********************************************************************
1465 * DbgUserBreakPoint (NTDLL.@)
1467 __ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
1470 /**********************************************************************
1471 * EXC_CallHandler (internal)
1473 * Some exception handlers depend on EBP to have a fixed position relative to
1474 * the exception frame.
1475 * Shrinker depends on (*1) doing what it does,
1476 * (*2) being the exact instruction it is and (*3) beginning with 0x64
1477 * (i.e. the %fs prefix to the movl instruction). It also depends on the
1478 * function calling the handler having only 5 parameters (*4).
1480 __ASM_GLOBAL_FUNC( EXC_CallHandler,
1482 " movl %esp, %ebp\n"
1484 " movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
1490 " call " __ASM_NAME("call_exception_handler") "\n"
1494 __ASM_GLOBAL_FUNC(call_exception_handler,
1496 " movl %esp, %ebp\n"
1498 " pushl 12(%ebp)\n" /* make any exceptions in this... */
1499 " pushl %edx\n" /* handler be handled by... */
1501 " pushl (0)\n" /* nested_handler (passed in edx). */
1503 " movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
1508 " movl 24(%ebp), %ecx\n" /* (*1) */
1509 " call *%ecx\n" /* call handler. (*2) */
1511 " movl (0), %esp\n" /* restore previous... (*3) */
1513 " popl (0)\n" /* exception frame. */
1514 " movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
1516 " ret $20\n" /* (*4) */
1518 #endif /* __i386__ */